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Патент USA US2507719

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May 16, 1950
2,507,717
A. L. JEROME
CODED TRACK CIRCUIT RAILWAY SIGNALING SYSTEM
Filed July 22, 1947
3 Sheets-Sheet 1
W 369 119
2,50797l7
A. a.. JEROME
CODED TRACK CIRCUIT RAILWAY SIGNÀLING SYSTEM
5 Sheetsß-Sheet 2
Filed July 22, 1947
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INVENTOR.
>Á'Pólz
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BY
Ammann/EY
May I6, 1950
A.' L. JEROME
CODED TRACK CIRCUIT RAILWAY SIGNALING SYSTEM
Filed July 22, 1947
SYSheets-Sheet 3
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INVENTOR.
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Patented May 16, 1950
2,507,717
UNITED STATES PATENT OFFICE
2,507,717
CODED TRACK CIRCUIT RAILWAY
SIGNALING SYSTEM
Arthur L. Jerome, Edgewood, Pa., assignor to The
Union Switch & Signal Company, Swissvale,
Pa., a corporation of Pennsylvania
Application July 22, 1947, Serial No. 762,617
5 Claims.
(Cl. 246-3)
l
2
My invention relates to coded track circuit
railway signaling systems for governing the move
tion of trañic also serves to govern the directional
stick relay for the opposite direction of traiiic.
In practicing my invention I employ at each
ment of traiiic over stretches of single track over
intermediate signal location means operative on
release of the code detecting means which gov
which trañîc moves in two directions. More par
ticularly, my invention relates to an improved
absolute permissive block signaling system em
erns the signal to momentarily connect in series
across the rails of the track section in advance
ploying cascade-connected reversible coded track
of the signal a source of current and an aux
circuits, for use in a centralized trallïlc control
iliary relay. This relay has a normally released
system in which the traffic direction is set up
and the head block signals are cleared by manual 10 contact which becomes picked up only if the
energy supplied from the source through the
control from a central office by means of an in
termittently operated communication system,
relay winding is of the value which is supplied
while the intermediate signals, which are con
when the rails of the section are shunted by a
train located at or near the entrance end of the
trolled solely by the track circuits, are cleared
accordance with the direction of energization of
the track circuit system.
section so that the relay will pick up if release
o_f the code detecting means was caused by en
trance of a train into the section at that end
In an absolute permissive block signaling sys
of the section but will remain released if release
automatically in one direction or the other in
of the code detecting means was caused by any
tem, such as is herein disclosed, directional stick
relays are provided in connection with the inter 20 other condition. The picking up of this relay
governs energization of the directional stick
mediate signals, each of which is normally ar
relay.
ranged to become energized when a train passes
The provision of an auxiliary relay and bat
the associated signal at clear or caution, and
when energized prepares a circuit for energizing
the next signal in the rear, governing trailîc
movements in the same direction to. permit that
tery, connected to operate as described above,
does not comprise my invention per se, but is
described and claimed in an application for Let
ters Patent of the United States, Serial No. 148,
967, filed on March 10, 1950, by Crawford E.
Staples, for Directional relay control circuits fol’
signal to indicate caution as soon as the block
section in advance is vacated by a train.
The principal object of my invention is the
provision of improved means for controlling these
directional stick relays bythe track relays of a
coded track circuit system, so that each direc
railway signaling systems, which application is
assigned to the same assignee as the present ap
plication.
At double intermediate signal locations the
code following approach relay which governs
lighting of the lamp of the signal for one direc
tion of traiiic is employed to govern the direc
tional stick relay associated with the signal for
the other direction. Where an approach relay
is employed for this purpose its adjustment is
controlled so that during the period in which the
tional stick relay becomes energized when the
code operation of the associated trackrelay-ceases
due to a train entering the corresponding track
section in the established direction, but not when
the operation of the track relay is discontinued
due to an opposing train overruning a head block
signal nor when the track circuit system is man
ually deenergized in preparation for reversing
the direction of traffic.
A further object of my invention is to provide
improved means of the type described which is
arranged so that the equipment at each inter 45
mediate signal location in the stretch is substan
tially self-contained and does not depend for its
operation on special energy impulses transmitted
over the track rails from an adjacent signal lo
relay is connected across the track rails as a re
sult of release of a code detecting means, the re.
lay contact will pick up only if there is supplied
through the relay winding energy of the value
which is supplied only if the rails of the asso
ciated track section are shunted by a train located
relatively near the approach relay.
Other objects of my invention and features of
novelty will be apparent from the following de
50 scription- taken in connection with the accom
cation.
Another object of my invention is to provide
improved means of the type described which is
arranged so that the operation of the equipment
is independent of changes in operating condi
tions, such as changes in ballast resistance or Oi Oi
in the voltage of the batteries from which en
ergy is supplied to the track circuits.
1A, 1B and 1C, placed side by side in the order
listed with Fig. 1A at the left, illustrate the track
A further object of the invention is to arrange ’
plan and Wayside circuits for a typical single
the equipment so that the approach relay which
governs the lighting of the signal for one direc
panying drawings.
I shall describe one form of apparatus embody
ing my invention and shall then point out the
novel features thereof in claims.
Referring to the accompanying drawings, Figs.
track block embodying the apparatus of my in
GO vention. The block shown includes two sections,
2,507,717
3
4
over which opposing trañic movements are gov
stick polar type, in accordance with the posi
erned by the entering head block signals ZRA
and ERB, Fig. 1A, and by the similar signals 4LA
and 4LB of Fig. 1C.
tions of control levers at the ofiìce. Two such
control relays are shown herein at each station,
and these comprise a traffic relay such as relay
2RFS, Fig, 1A, which governs the direction of
trafiìc movements in the single track block by
Similar reference characters refer to similar
parts in each of the several views.
Energy for the operation of the relays other
cooperation with a similar relay 4LFS at the
than the track relays is furnished by suitable
sources of direct current, not shown, whose posi
tive and negative terminals are designated B
and C, respectively. Each track switch and each
railway signal is identiñed by a number identi
fying its location, the signal designations also in
opposite end of the single track block, shown in
Fig. 1C, and also include two code signal control
cluding the suflix L or R to indicate the corre
sponding direction of traffic movements to the
left or right, respectively. Each relay is identi
ñed by a characteristic letter or combination of
letters, preiixed by the designation of the switch
or signal with which it is associated. The track
relays ZRTR, GLTR, SRTR, and 4LTR, and also
relays, such as the relays ZRHS or ßLHS, by which
the clearing of the correspondingly designated en
tering signals is made subject to manual control
from the ofi'ice.
Each trañìc relay ¿LFS or ZRFS when in its
normal position as shown, with its left-hand con
tacts closed, designates its location as the en
trance end of its block, in which position the
traffic relay enables the adjacent entering head
block signal to be cleared under proper condi
tions, in response to the reversal of the associ
ated code signal control relay ZRHS or 4LHS.
Each traiiìc relay when reversed, with its right
hand contacts closed, designates its location as
the exit end of the block. In this position the
traiiic relay supplies energy to the signal circuits
for the block to enable the signals which govern
traiîñc movements toward its location to be
cleared.
the approach relays SRAR and SLAR are code
following relays of the biased polar type, such as
shown for example in Letters Patent of the United
States No. 2,057,605, issued October 13, 1936, to
Herman G. Blosser. These relays are constructed
and arranged so that the contacts of the relay
are normally biased to their released position and
will pick up when and only when energy flows
The trackway system includes continuous track
through the winding in the direction indicated
30 circuits for all main track. The detector sec
by the arrow thereon.
tions IT and 3T at the ends of the block each
The periodically operating contacts of the code
have a conventional track circuit including a
following relays are distinguished from those
track relay, such as lTR, which is normally ener
of the other quick acting relays by horizontal
gized by a battery ITB. The remaining track
dotted lines indicating their closed positions
circuits ZR-GLT and ßR/-dLT of the single track
and the contacts of slow acting relays are identi
block are of the reversible coded type, connected
fied in the conventional manner by the vertical
in cascade when the block includes two or more
arrows thereon. It is to be understood that the
sections, and provide means for controlling the
slow acting relays having condensers bridged
signals for both directions to provide three indi
across their windings have release periods of
40 cations and also for indicating at either end
about iive seconds.
whether or not the block is occupied, without line
Each of the wayside signals shown in the draw
wires.
ings is of the well-known color-light type, hav
In this application only the portions of the
ing a green lamp G, a yellow lamp Y, and a red
wayside apparatus essential to the understanding
lamp R, with the exception of signals ZLB and
4RB, which do not include the green lamp G. -, of this invention have been shown and the re
mainder of the equipment may be arranged in
The signals at the ends of the single track sec
any of several arrangements well known in the
tion are shown as being continuously lighted,
railway signaling art.
while the intermediate signals 6L and. BRI are ar
The present invention relates more particular
ranged to be lighted only when the track section
ly
to the coded track circuit apparatus, and is an
in the rear of each signal is occupied by a train.
improvement upon that disclosed in an applica
Inasmuch as my invention relates to wayside
tion for Letters Patent of the United States, Serial
apparatus, the centralized trai’iic control system
No. 596,470, filed May 29, 1945, by Henry S. Young
by means of which the direction of energization
for Railway traffic controlling apparatus. In the
of the signal circuits and the clearing of. the en
system of this Young application, the coded track
tering signals is made subject to manual control
circuits are normally deenergized and are set up
from a central ofñce is not shown herein, but it
by manual control by reversing the trafllc relay
is to be understood that this is preferably a re
at the exit end of the block for the desired direc
mote control system of the code type such as that
tion of traffic movement, and then reversing the
disclosed in Letters Patent of the United States
code signal control relay for the entering signal
No. 2,229,249, issued January 21, 1941.1, to Lloyd
at the other end of the block. The system of
V. Lewis, for Remote control systems, or more
the Young application is also arranged so that
particularly, as a modification thereof described
when a train vacates the block and an indication
in a publication entitled “Centralized Trañic
of that fact has been transmitted to the office,
Control System-Time Code Scheme, Manual No.
506A,” published by the Union Switch and Signal 65 the operated traine relay is restored automati
cally to normal, and the wayside circuits thereby
Company, Swissvale, Pennsylvania. For an un
restored to their normal deenergized condition.
derstanding of my invention, it will suiiîce to
This mode of operation may be employed in con
point out that the remote control system has a
nection with the track circuits of my invention.
ñeld station at the end of each block which is
connected with a control ofiice by a line circuit 70 or they may be left energized until a reversal
of the trañîlc direction is required to thereby pro
over which codes are transmitted in either direc
vide a normally energized system. It is also to
tion for selective communication between the
be understood that the remote control system
office and the different stations, one at a time.
preferably includes means for preventing the o_p
The control codes transmitted to the stations
serve to operate a group of control relays of the 75 eration of the traffic and signal control relays
asovfzw
5
except under the proper’trañìc conditions, so that
a signal cannot be put to stop by the operation
of any lever other than its control lever, one ar
rangement suitable for this purpose being dis
closed in the above-mentioned Young application.
In> the coded track circuit system as disclosed
herein, the coded currents are generated by code
transmitters of the pendulum type designated
I~80CT andV VECT, which are energized continu
ously and~ operate their contacts periodically at
a' rate of 180 o1' 75 tinies‘per minutes, respectively,
to periodically operate a transmitter relay such
as relay ZRC’I‘, by which the coded energy of. the
selectedr frequency is supplied to the track rails.
Each code following track relay, such as relay 15
ZRTR, is provided with a slow release, .iront con
6
The operation- of the system is generally simi
larl for both directions of traffic movement and
the circuits' of Fig; 1C, therefore, are` similar to
those of Fig. 1A, except that they are oppositely
directed. Likewise, the apparatus at the- inter'
mediate signal location of Fig- 1B is similar' for
each direction but oppositely directed. In Fig.
I‘B, but one set of decoding apparatus ls used, this
being arranged for either direction of operation
depending upon which of thetrack relays isoper
ated, and in addition, a pair of directional. stick
relays, such as ERSR,l and BLSR are provided for
tact, repeater, such as’ the relay ZRTF', which re
mains picked up as long as the track` relay is
controlling the energization of the track circuit
system as required for following train movements
inf either direction.
In describing in detail the operation of the sys
tem embodying my invention, itis assumed that
the apparatus is in its normally deenergized con
responding to vcoded energy.
dition, as shown.
It will now be assumed that
The code responsive apparatus at the Vdifferent ..0 the operator desires to` move a train from right
signal locations is substantially similar>v and its
operation will be understood from a description
of that of Fig. lA, where it will loev seen that the
closing of front contact a ofy relay ZRTR in re
to left through the block. By operation ofthe
control levers at the control oiiice, the trañîlc relay
ZRFS of Fig. 1A, and the code signal control relay
sponse to the supplyl of an impulse' of coded .,
sitions.
ll'LHS' of Fig. 1C are operated to their reverse po
‘
At this time, since signal f'iLA is at stop, the cir
energy to the ‘winding of relay ERTR establishes
cuit for supplying energy to the signal repeater
the circuit for supplying energy to the winding
relay ZLAPC* is interrupted and the contacts of
of relay ZRTF. When the contacts of relay ZRTF
relay ELAPC are released. The circuit for con
pick up, its front contact a establishes a circuit
for supplying energy to a code following repeater 30 trolling relay 2LAPC is not shown, but it may be
of any of several` well-known typesin which the
relay ZRTP' each time that' the relay ZRTRY re
relay is energized when and only when sig-nal ZLA
leases its `Contact a. Additionally, when relay
displays a yellow or a green aspect. According
ZRTF picks up, its contact b establishes a circuit
ly, a circuit is established to supply energy of 15
for supplying energy to the> primary winding of
decoding transformerl 2D'I` over' contact a; of re 35 code frequency to the transmitting relay ZRCT.
rl‘his circuit is traced from terminal. B', over con
lay ZRTP. As the contacts of relay ZRTP are
tact a of code transmitter 'F5CT, over back con
recurrently picked up and released»v in response
tact a of relay îLAPC, iront contact a of relay
to the code following operation of contact a of
l-TR, over reverse polar contact a of relay 2RFS
relay ZRTR, contact a, of relay 2R'I`P` alternately
energizes the lower half and the upper half of 40 and through the winding of relay 2RCT to termi
nal C, whereby the contacts of the relay ZRCT are
the primary winding of decoding transformer
operated at the '75 code rate.
ZDT. As a result,V 'current is induced. in the sec
When Contact a of relay ZRCT‘ picks up, it in
ondary Winding'of transformer 2DT which is rec
terrupts the» connection of track' relay 2RTR to
tiñed by contact b of relay ZRTP and supplied
the rails of section ZR-ÈLT, and establishesv a
to the winding of a slow :acting code detector
relay> ZRH. It will be seen that the. relay- 2RH` 45 circuit for supplying energy from the battery
'LPRTBV through the winding of relay ERTR and
will be energized when and onlyV whenl they track
the rails ofV section ZR-ELT to the winding of
relay ZRTR is following code. Transformer ZDT
relay lìLTR, shown in Fig. 1B. This circuit is
also supplies code frequency energy to the' decod
traced from the positive terminal of battery
ing unit lâ?DU which is of a type well known
inthe art. rl‘he decoding unit» l80DU is con 50 ZRTB, over front contact a of relay ZRCT,
through the winding of relay ZRTR, over rail 5
structed and arranged so that it will supply energy
of section 2Rf---6LT, through the winding of Yrelay
of a value suiiicient to pick up the cont-acts of
GLTR, Fig. 1B, over back Contact a, of relay GLC-T,
Arelay ERD when and only when» the frequency
and over rail 6' to the negative terminal of bat
of the energy supplied tothe decoding unit from
transformer ZDT is of the order of 180. cycles 55 tery ZRTB. The direction of'ñow of energy is
such thatl the contact of relay ZRTR remains re
per minute. Accordingly, relay ZRD willbe ener
leased, and the contact of relay SLTR becomes
gized. when and only when the code following
picked up.
relay ZRTR is responding to 180 code.
When contact a of relay ERCT releases, the cir
The circuits for controlling track switches IW
cuit traced above is interrupted, and the contact
and 3W which lead to the passing tracks at the
of relay BLTR. releases. Accordingly, at this
ends of the single track blo-ck have been omitted
time, the coded energy supplied to the left-hand
in order to simplify the drawings, and it will be
end of the> rails of section ZR-GLT causes the
understood that when switch IW ls locked in its
contacts of relay GLTR to be operated at the 75
normal position as shown, a normal switch re
peating relay INWP is energized, andwhen switch 65 code rate. The recurrent operation of the con
tact of relay BLTR causes energy to be supplied
lW is locked in its reverse position, a, reverse
over- front contact a of the relay to the winding
Vswitch repeating relay lRWP is energized over
of rel-ay' BLTF, and as a> result,‘the contacts of
vthe contacts N and R of a circuit controller
relay ûLTF pick up and remain picked up as long
actuated by switch IW. These relays serve to
select the signal lighting circuits for signals 2BA 70.. as relay EìLTR is following code.
When contact ct of' relay GLTF picks up, it es
or ZRB, in accordance with the position of' the
tabli'shes a circuit for supplying energy to*> the
switch 9W, the selected signal displaying a yel
code following repeater relay êiTPeach time relay
low aspect when the code detector relay ZRl-I is
‘ GLTR releases its contact a'f/ï' This circuit is
energized, or displaying` a green aspect if relay
75 ltraced from terminal B, over back contact ¿1,- of
ZRD is also energized.
252507,71?
8
relay GLTR, front contact a of relay GLTF, back
contact a of relay BRTF, and through the Wind
ing of relay GTP to terminal C. As a result, the
relay BTP will recurrently pick up and release its
contacts in accordance with the operation of con
tact a of relay SLTR.
The primary winding of decoding transformer
GDT is now supplied with energy by a circuit in
4LTF, so that at this time, the contacts of relay
ALTF are picked up.
Each time contact a of
relay 4LTR releases, energy is supplied over front
contact a of relay 4LTF, to the winding of relay
4LTP. Accordingly, the contacts of relay 4L'1’P
are picked up and released 180 times per minute
in accordance with the operation of contact a
of relay 4LTR.
cluding front contact c of relay SLTF and contact
The primary winding of decoding transformer
a of relay BTP. The recurrent operation of con
tact a of relay STP causes energy to be alternate
ly supplied to the upper and lower portions of the
primary winding of transformer GDT, and as a
result, an alternating current is induced in the
secondary winding of the transformer. This en
ergy is rectiñed mechanically by contact b of
4DT is now supplied with energy by a circuit
including front contact b of relay ALTF and con
tact a of relay 4LTP. The recurrent operation of
contact a of relay 4LTP causes energy to be
alternately supplied to the upper and lower por
relay GTP, and is supplied to the winding of the
code detecting relay 6H to thereby cause the con
tacts of relay 6H to pick up and remain picked u-p
tions of the primary winding of decoding trans
former 4DT, and as a result, an alternating cur
rent is induced in the secondary winding of the
transformer having a frequency corresponding to
the code rate, which at this time is 180 per minute.
as long as relay ETP is following code. Addition
This energy is rectified mechanically by contact
ally, energy is supplied from the decoding trans
b of relay ¿.LTP and supplied to the winding of
former GDT to the resonant decoding and rec
code detector relay ¿LH to thereby cause the
tifying unit ISEE DU, but since the code rate at
contacts of relay 4LH to pick up and remain
this time is only '75 times per minute, the energy
picked up as long as relay ALTP is following
supplied from the decoding unit |80DU to the 25 code. Additionally, energy is supplied from the
relay DR is insuñîcient to pic-k up the contacts of
decoding transformer 4DT to the resonant decod
relay DR.
ing and rectifying unit I80DU, and since this
When relay 6H picks up, its contact a estab
energy has a frequency of 180 cylcles per minute,
lishes the circuit for supplying energy to the code
the decoding unit IBBDU supplies sufficient
transmitter IBBCT, and contact b of relay 6H
energy to the relay ALD to pick up its contacts.
establishes a circuit for supplying energy to the
Since it is assumed that the code signal control
transmitting relay BRCT, which circuit is traced
relay ALI-IS has been reversed by the central
from terminal B, over contact a of code transmit
office operator and since switch 3W is normal,
ter ISSCT, front contact b of relay 6H, over front
the picking up of relays ¿LH and ALD establishes
contact d of relay SLTF, over back contact ’b of
a circuit for supplying energy to the green lamp
relay BRSR, and through the winding of relay
of signal GLA. This circuit is traced from termi
BRCT to terminal C. As a result, the contacts of
nal B, over reverse polar contact a of relay 4LHS,
relay SRCT are picked up and released at the 180
over front contact b of relay STR, over front
code rate. Additionally, contact c of relay 6H
contact a of relay 3NWP, over front contact a of
establishes the circuit for connecting the con
relay liLH, front contact a of relay 4LD, and
denser Q to the source and a charge of energy is
through the green lamp G of signal 4LA to
built up in the condenser.
terminal C. Accordingly, at this time signal ALA
When the contacts of relay BRCT pick up, a
will display a green aspect, indicating “proceed”
circuit is established to supply energy from bat
If the operator now clears signal ZLA by means
tery SRTB to relay 4LTR, Fig. 1C. This circuit
of circuits not shown, the relay ZLAPC will be
is traced from the positive terminal of battery
come picked up, and its contact a transfers the
BRTB, over front contact a of relay GRCT, over
circuit for supplying energy to relay `ZRCT from
front contact b of relay SRCT in multiple with
contact a of code transmitter 15CT to contact a
the winding of relay GRTR, over rail 6 of section
of code transmitter IBGCT. As a result, relay
6R-4LT, through the winding of relay ÃLTR,
2RCT operates its contacts 180 times per minute
over back contact a of relay 4LCT, through rail
and the supply of energy from battery ZRTB to
5 of section BR-ISLT, and through the resistor
the rails of section ZR-GLT is coded at that rate.
Rl in multiple with the winding of relay SLAR
Relay SLTR, Fig. 1B, now operates its contacts
and resistor R2 to the negative terminal of bat
180 times per minute in response to the 180 code
tery SR'I‘B. A portion of the adjustable resistor
supplied to its winding, and repeater relay ETP
R2 is shunted at this time by the circuit governed
also operates its contacts 180 times per minute.
by back contact b of relay GRTF, by the relay
Accordingly, energy of a frequency of 180 cycles
GLAR and the resistors Rl and R2 associated
per minute is supplied from decoding transformer
therewith are selected and adjusted so that the
GDT to the decoding unit IQGDU, which now
value of energy which flows through the approach
relay SLAR at this time is insuiiicient to pick up 60 supplies sufñcient energy to relay 6D to cause the
relay to pick up its contacts, thereby conditioning
the relay contact. The direction of ñow of en
the signal 6L to display a proceed or green aspect
ergy is such that relay dLTR will pick up its con
when energy is supplied to its lamps.
tact and relay BRTR will remain released. The
The movement of a train from right to left
shunting of the winding of relay SRTR by front
contact b of relay SRCT affords a lower resistance 65 through the single track block will now be traced,
assuming that the signals 2LA, 6L, and ISLA have
to the flow of energy in the circuit traced above.
been conditioned to indicate proceed as above
When the contacts of relay GRCT release, the cir
cuit traced above is interrupted, and the contacts
described.
of relay 4LTR release. Accordingly, at this time,
When the train moves past signal 4LA and
the contact of relay 4LTR in Fig. 1C picked up 70 enters the detector section 3T, detector track
and released 180 times per minute in response to
relay 3TR is shunted and its contacts release.
the coded energy supplied over the rails of sec
Contact b of relay 3TR interrupts the circuit pre
tion 6R-4LT.
viously traced for supplying energy to the green
Each time relay 4L'I'R picks up, energy is sup
lamp G of signal ALA and establishes the supply
» plied over front contact a to the winding of relay 75 of energy to the red lamp R of the signal.
/
Tz..
restar/rv'
VI()
rfsinä'piy ‘vof fef'rîërgy vthereto ¿has been ’mte?rupte'd
It is Ato bïe'únderstolod tl'iatz'at‘thi's timeltheccöde
signal control 'relay ‘ÄLHS ’is restored automati
‘fcfally tou 'normal -and axliindi‘catiònof >rthe occu
"bythe‘reieese òf the trackreiays.
. ..
c’A'ieee'rdihgry, 'there will jbe ‘a "'s‘üts‘tantiai itihi'e
.interval betweenft‘lieo‘relea's'eîof "relay 'Elia d th‘e
j'pancy'of sectionfä’l‘ istra M iit'te'd to the control
òflìce as ’described inthe anual Iidentified above. q5 'release of‘rélaiyGL'l‘Fàïf er the >su'r‘ip'l'yo'f'fe'?îe'rgy
when the 'trein entersjseetijehjthgthr, the
L¿reve/‘aah'or triesejreieyshas been eu‘t'erf Iby the
"cessation "oi 'operation "of 'the ‘co?itact'oï "relay
'operation ceases. Qontact a of relay 'ßL'l‘R 're'
‘
leases "and remains released at'tliis time, and 'the
’
’ ‘
"
w
`
‘
"
‘
x
"time ihtervalja Leircuitjîs es
p
g 'energy from (the vv¿50n
*supply Aof ‘energy to ‘relay'ßLTF ‘is 'cut oli as a
result, but it retains *its corï'actsfpicked'np iintil
»» denser ¿Q 'tejthe ft nsïriitte'rfrelhly thor. ’This
the energy Lstored in >tire4 '_'e‘onde'ri's‘er ‘connected
coridekr'iser1 Q, _over ck Iïic'in'ta‘ct"'c 'of relay ‘Gil-I»,
rf htj‘ëhhtee't ff for lr_ y V‘trrrrg ~ever ’back ‘eeh-‘tact
'a or rete-y "thsRfem 'through theÀ wiriding’fef
across its winding is dissipated. The >contacts„of
'relay vlìLTl? are Ipicked up 'continuously iorìth‘is
time> interval, b'ut 'energy is no vlonger lsupplied 'to
'relays ¿lLî-I and`äLD_"fr'om 'the transformer lf’lDT,
-‘circuit is? 'tha‘cèéll "fr
the >~leLE'Í'Í-‘llíriîful4~ 'elerrientìóf
V16 relay "GLCT'V'Í‘JÓ 'të?mîifì‘aTC ‘aI'Ídt thus to the I'ìglfil‘í-A
hand element o_f condenser Q. ~
:and the contactant these relays release.
Suhseqliently, the Icontacts of ‘relay 'ilLT?f fe
lease, interriiptirfg the ‘snpplyof èn‘efg‘y'to relay
y "when theí'îeehtaetsor'reieysLc'rfpiek up'fè'?er
"f
supplied
battery rBLTBv through 'the
"er relay BRAB 'over the ’cireuit which is
’ein thefp‘osïtiye 'term-maier battery’tLirB,
llï'rTP'and to the prir‘nary Winding of transformer
Y c’e'rïtact a qfreieytnc'r, fr‘ht‘eehtaet
lay `FaLcT "and “the winding 'erreiay ‘SL-TR
Y ,
edteîd 'heult'time,v throughraii 5*, throt'ghthe
>pp'erate its contacts, supplying 'coded energy jfrom
battery yarma threïiehresister RlA ¿and ap
through the warrant ‘rear @LAR `and a ror
tiohef'r'esisto'r Rg jte ‘theraiis ef‘seetidh «3R-'mr
jëelserid asies‘ef'the ’traîrhthrmrgh rail '6, arid
"thei'i'ceftorftlie ` atiifeter'rninaVof 15attery"‘6lî.TB
_through the fresis ò'r Rßfariìd Winding "of "relay
Due te the V'shurrtihg erregt of them‘wheels ‘and
Y‘axlesuof Íthe train, the Current supplied to >the
rens frem battery 'SRTBY’in'creases asthe `train
“È
'eqiiipmentarear ' 'h'gfed and proportion dj‘so 'that
`Iresistor R‘t to 'beinserted inthe circuit _of 'relay
distance 'óf rthe signal 6L,` as for ‘example
teredthe section thefresista?ce in fthe above "c'i‘r‘e
ehrhjharatiyely loma u the’relay‘fßR’AR’ahd
"other „portions _öl 'the 4lcir'cùfi't fare ‘selected >`so ' that,
'rret‘with‘stahdihg the 'fact ‘that ’the ’whoie or re
,_
`At thisltime, contact g of l'relay"iìîlli'ï‘lí‘is"iïic‘láëd
' ’ `_ ' ' '1513.1 '_The various parts '_"o` the '30
up, causing 'the “entireuai'riounft of 'res''ist'arí'cîeI of
¿there „Howeveh with ‘ the train khaving iJust "eh
feet,_the value _of currentwhichiiows ,_l'ìïllîollë .
ty'ih'dihg of aphreaehrelày there heeemejsj suffr
Vçìe?ft toy cause the relay l'to_operatemîts,contact
Each time Contact ¿rief 'i‘elaylöLAR pies
'energywis snppli'eìd‘to the slow rel se >appr h
4repeater relay
hy the 'eireuit which is traced
lfrom terminal lâ, ,overvi'ront c'nta'ctl'c't of relay
‘inseries which are'c‘onri‘ected in 'r'nùlti‘ple
`>tvitl'i resi'stór‘R'B.
>¿sister Ril is in A'seriestvitli :the Winding o'f’ï'elay
SRAR, the current new ‘throughlth‘e reia'y'tvihdìhg
at this time is súffì'cie'n't‘to 'canse the relay t‘o’pîòk
40
BLAR, beek eohtaet e 'er relay tarn, ¿het ugh
the winding, O_f relay .ûLAlî tqieiîmillelfç .fìSëGO?d
ine'ly, relay ëìLAPìiëßälèïgiZêSï aißhë... 5111.11?, arid. its
_front Contact q. establishes the circuit for supply
its
contact.
_l
u
Ä
_l
w
„_
‘_
n
“When relay
picks iipyitswfront contacta
’establi'shres'a ‘cir-_chit 'for sìip'plyingïener’gy tothe
"d
traded
"ee'tíqnalñ‘stìçk
trom terminer
relayB, BLSB.
>eter ‘rreht’eònte‘ct
A
circuit'eef
relay `QGRAR, ‘front ‘ehhta‘et ‘e er‘r’ela'y fsLTF, and
ing- energy y_to the greenlam 4"G of signal Sli, which
circuit is tracedïrom„termlaallaçver @et .Ceri
Vtlir'fjvíífglri the winding 'of ‘relay BLSR to Aterminal
tact a of relay GEAR frsint'cfmtaçtìißfßëïey 6H,
over iront Contact d _of relay GcDyand throughgthe
V'stick"c‘ircriiit is ’established ‘to maintain the "relay
C. When thee h_t’aetsjefjreiaysLsRi-'pîekuefa
green lamp G of the _signal to‘terrninalg, thns
enea 'energized and 'is ‘traced ¿frein [email protected] B,
When the rtrainÍ passes. signal‘lìlr` and enters
ì Additien'aliyhwhen relay' sL'sR picks "up, its
over back contacte yo’f Arelay ‘6I-I, 'over `>front oon
causing signal 6L todisplay a proceed aspect to 50 taet
b’öf reiay'tLsr_t,'ähd through the >windì'ìiig of
the approaching train.
Y
y
‘rei'a'ytnsa te terminare.
_
n
section ‘2R-SLT, relay GL'IK‘R is~ shunted _audits
"Óonta'étrt interrupts ' the 'circuit ‘p'rèví'oùsly 'traced
contact a releases and remains released and4 Cuts
:for ’Sùpplyin’g Penergy't‘o 'thewinding of relay BLCT,
55
oiî the supplyof energy to relay GLTF. However
and `its 'c‘ontacts 'release -‘and "interrupt the-hup»
the relay SLTF issloW Yin releasing and after _re
ply of energy frehrhattery GILTB to‘relay 'aR’AR'se
lease oi relay BLTR; the circuit 'including back
that ‘relay BRAB 'releases andihterrupt's ‘the‘piea
contact a of relay BLTR for supplying 'energy to
“dp 'circûit‘ef relay SILSR. LThe relay SLOT isihade
relay STP is established and the ‘contacts of re
lay ETP remain picked up for 'a substantial time
interval. The cessation of operation of the con
tacts of relay BTI-‘cuts off the Supply ofen'ergy
from transformer BDT to relays 6H and >6D and
these relays release after a short 'time interval
which is less than the time required for relay
BLTF tore'lèa's'e. When contact d of relay 6H re
leases the supply of energy to the green -lamp >Gr
of signal 8Lj is _int'erriipt'ed,_ andthe circúit is
established for supplying "energy to the red l'aiiip 70
R of signal 6L.
_y
slightly slow in'rel‘easing by. means of 4a 'snubbing
resistor Y‘connected'across the winding 'ofA relay
ELCT 'and after the lsupply‘of energy to 'the :Wind
ing ofrelay SL'CT is interrupted', -its contactsremain picked 'up fora short time interval', thus
'assuring 'that relay/SRARwill remain pickedçup
"andwí'n'aintain the siipp'l'y of "energy to r'elay'lìLSR
for ‘asufñci'ently lóngïtirne interval to insure 'that
"Contact b ïò'f relay‘BLSR establishes'tlïe stick c'i'r
'cùit traced above.
.,
.
.
A short time‘iater, ‘relayîßLTF releases' and its
"Contact b 'additionally interrûpts the. pickèup
circuit tvhi'ch 'ii/afs previously. traced for _relay
BLSR. ’Aêl's‘o'contact i7 öfï‘relay GLTF again shunts
part of the resistor R4 in series with the .Winding
paci/ty' so that these relays dwill reniajin picked "rip
r,for ài 'comparatively long tÍÍné interval ä'ft‘ër the '15 of 'relay lSR‘A‘R, 'büt at this timerelay 'SLCT‘iÈ re,
ÀThe relays GLTF andHRTF are `vselected v.and
arranged >With‘condenser s'nnb‘s,v of suftlëie?t ca
2,507,717
leased and the circuit of relay GLCI‘ is inter
rupted by contact a of relay BLSR with the result
l2
detector track section IT, the detector track
lay GRAR will not pick up again.
When contact f of relay BLTF releases, a circuit
relay ITR is shunted and its contacts release.
When contact a of relay ITR releases, the cir~
cuit previously traced for supplying energy to
transmitting relay 2RCT is interrupted so that
is established for discharging any energy re
coded energy is not supplied to the rails of sec
that relay BLCT will remain released so that re
tion ZR-'GLT after the train vacates that sec
maining in the condenser Q at this time. This
tion. Additionally, it is to be understood that
circuit is traced from the left-hand element of
when the train under consideration enters sec
condenser Q, over back contact c of relay 6H,
tion IT, signal 2LA will be put to stop, and as a
back contact f of relay BLTF, and over back con
result, the relay 2LAPC will be deenergized and
tact f of relay SRTF to terminal C and thus to
its contact will release.
the right-hand element of condenser Q.
When the train vacates section IT, relay ITR
At this time the code transmitter 'I5CT is set
picks up, and contact a of relay ITRI again es
into operation by the supply of energy thereto
by a circuit including front contact c of relay 15 tablishes the circuit for supplying energy to relay
2RCT. However, since the relay ZLAPC is re
GLSR.
leased at this time, the circuit is governed by
When contact b of relay 6H releases due to the
contact a of code transmitter 15CT, so that relay
entrance of the train into section 2R-6LT, the
2RCT supplies energy coded at the '75 code rate
circuit previously traced for supplying energy
coded at 180 times per minute to the transmitter 20 from battery ZRTB to the rails of section
ZR-SLT.
relay SRCT is interrupted. Shortly thereafter,
The relay BLTR follows the coded energy sup
relay BLSR picks up and its front contact d es
tablishes a circuit for supplying energy coded at
75 times per minute to the transmitting relay
BRCT. This circuit is traced from terminal B,
over contact a of code transmitter 15CT, front
contact d of relay SLSR, over back contact b of
relay GRSR, and through the Winding of relay
GRCT to terminal C.
plied thereto over the rails 0f section ZRf-GLT,
and as a result, the relays GLTF and 6H pick
if relay 4LHS is again reversed by the operator,
As a result, energy is no longer supplied from
battery 2RTB over the rails of section ZR-SLT
up, as previously described.
When contact a
of relay 6H picks up, it interrupts the stick cir
cuit previously traced for relay SLSR, and relay
ELSR releases. When relay GLSR releases, its
front contact d interrupts the circuit previously
As a result, energy is now supplied to the 30 traced for supplying energy to the relay GRCT
over contact a of code transmitter 15CT, and
rails of section BRf-ALT at the 75 code rate, and
additionally, contact c of relay SLSR interrupts
since the rear portion of the train still occupies
the supply of energy to the code transmitter
section BRf-IELT, the approach relay GLAR will
15CT.
‘
now operate its contacts at the 75 code rate, and
The code transmitter IBUCT is now energized
relay GLAP will remain energized. The release
by the circuit including front contact a of relay
time of relay BLAP is made sufficiently long to
6H, and front contact b of relay 6H and front
bridge the time necessary for the equipment to
contact d of relay ‘BLTF again establish the cir
operate to change the code speed of relay BRCT
cuit for controlling relay BRCT over contact a
from 180 to 75 times per minute.
When the train under discussion vacates sec 40 of code transmitter I8UCT. Also, the condenser
Q is supplied with energy over front contact c
tion BR-IILT, the removal of the shunt decreases
of relay 6H.
the amount of current supplied thereto from the
' Front contact d of relay 6H, and back contact
battery ERTB, and as a result, the flow of energy
a of relay 6D prepare the circuit for supplying
through the winding of relay BLAR falls below
energy to the yellow lamp of signal 6L should
the value necessary to pick up the contact of
an approaching train cause the relay GLAP to
relay GLAR and it remains released. Accord
pick up, as previously described.
ingly, energy is no longer supplied to relay BLAP
With the contacts of relay BRCT operating at
over the circuit including front contact a of
the 180 code rate, energy is supplied from bat
relay GLAR, and after a time interval, the con
tact of relay ELAP releases.
50 tery GRTB to the rails of section SR-IILT at
the rate of 180 impulses per minute. The re
When contact a of relay BLAP releases, it in~
sponse of relay 4LTR. to the coded energy sup
terrupts the circuit previously traced for supply
plied thereto causes the relays 4LTF, 4LH, and
ing energy to the lamps of signal 6L, and, as a
4LD to pick up, as previously explained. Ener
result, the red lamp R of signal 6L is extinguished.
> 1 At this time, as previously explained, energy 55 gization of relay 4LD may be employed in any
suitable manner to indicate that the entire single
coded 75 times per minute is supplied to the rails
track stretch is vacant, but this means is not part
of section 6Rf-4LT by the operation of the con
of this invention and has been omitted in order
tacts of transmitting relay GRCT, and when the
to simplify this disclosure.
section is vacated relay IILTR responds to the '75
With the single track block unoccupied, and
code supplied over the rails of section 6R-4LT, 60
the traiiîc relay 2RFS reversed to set up the di
energizing relays 4LTF and 4LH in a manner
rection of movement from right to left, as de
similar to that previously described. However,
scribed above, it is assumed that the operator
since the contacts of relay 4LTP are operating
at the control oñice restores the traftlc relay
at the '75 code rate, the relay ALD does not re
ceive suiñcient energy from decoding trans 65 ZRFS to normal.
When reverse contact a of relay ZRF‘S opens,
former 4DT and the decoding unit I80DU to
the supply of energy to relay 2RCT is cut off.
pick up its contacts at this time. Consequently,
signal ALA will be cleared in a manner similar
to that previously described, except that, since 70 to relay SLTR, and relay BLTR releases and re
relay 4LD is released, the signal will display a
yellow aspect, indicating that the next signal is
displaying, or is conditioned to display, a red
mains released.
As previously explained, the release of contact
a of relay GLTR results in the release shortly
thereafter of the contacts of relay BH, but the
aspect.
As the train passes signal 2LA, and enters the 75 contacts of relay SLTF remain picked up for
2,501,711
a, frelatively long time interval after release Vof
relay GLTR..
rectional stick relay, such 'as relays BLSR or
GRSR, lis energized when the code operation of
When contact c of relay 6H releases, it estab~
lishes the previously traced circuit for supply
the associated track relay >ceases ‘as a result of ,a
train entering the corresponding track sectionatthe entrance end thereof, but is not energized »if
ing energy from condenser Q >to the winding of
relay GLCT. Accordingly, the contacts of relay
6LCT pick up and connect the battery ÍfLTB
the code operation of the track V.relay ceases when
the section is not occupied.
across the rails of section ZR-BLT in series with
the resistor R4 and the Winding of relay GRAB.
in parallel with resistor R3.
At this time, contact g of relay BLTF is picked
This result is secured by vproviding at each
intermediate signal location means effective upon
release of the code detecting relay governed by Aa
track relay at that location vto temporarily .con
nect the -associated track battery and approach
relay in series across the rails of the track sec
tion in advance of the signal. At this time the
approach relay is adjusted so that energy sufû
cient to pick up the relay contact issupplied from
up, and the entire resistance of resistor Put is
connected in series with the Winding of relay
BEAR, but since section ZR-GLT is assumed to
be unoccupied, the value of energy which ilows
through the winding of relay GRAR is-insufñcient
to pick up the contacts of the relay.
1.4
v.F‘rz'n'm the foregoing it will be seen that `the «ii-
As va re
the track battery through the winding of the
approach relay only if a train is present at that
end of the track section, While the directional
stick relay is governed by the approach relay so
sult, the circuit previously traced for picking up
the directional stick relay @LSR is not established
by vfront contact a of relay GRAR, and relay
BLSR does not pick up at this time.
After a short time interval, the energy from
as to be picked up if the approach relay picks up
at this time.
When the track battery is connected across the
condenser Q is dissipated, and relay BLCT re
leases, cutting ofî the supply of energy from bat
tery SLTB to the rails of section 2R--6LT.
When relay SLTF releases, its front contact f
track rails at an end of a track section in series
lay yGLCT from condenser Q, and if relay BLCT
With the Winding of the approach relay the ener
gy supplied through the winding of the approach
relay is of a high -value >if a'train occupies that
is not released, it‘releases at that time.
`When relay 6H released its contacts, its front ,¿
contact .a interrupted the supply of energy to
code transmitter 'l3ßCT, and front contact b of
end of the track section but is of a low value
if the track section is not occupied, or if a ,train
is present in a distant portion of the track „sec
tion so that a considerable length of .track rail
relay 6H interrupted the circuitl for supplying
is included inthe circuit :of the `track battery
energy to relay @RCT over contact a of code
transmitter lßûCT, and since relay SLSR does _.
and approach relay.
interrupts the circuit rfor supplying energy to re
»Occupancy kof an end portion of a track section
produces a much greater >increase in the value
not pick up at this time to supply energy over
its ïfront contact d and contact a of code trans
mitter 'ISCT to the winding of relay BRCT, the
contacts of relay SRCT remain released.
of the energy supplied from the track battery
through the winding of the approach relaythan
is produced by variations iin other conditions,
As a result, coded energy is no longer` supplied
such as changes in lballast resistance or in the
from battery @RTB over the rails of section
voltage of the track battery. Accordingly, at
the time the code detecting relay releases the
approach relay may be adjusted to respond only
6R~--4LT to the winding of relay 4LTR, and relay
lLTR releases, which results in the releasing of
relays 4LTF, 4LTP, @LH and ALD, as previously
explained.
The system is now vrestored to its normal lor
deenergized condition as shown in the drawings.
The energy impulse supplied to the rails of
section ZR-GLT during the picked up period of
relay SLCT will pick up track relay ZRTR at the
other end of the section, and relay ZRTF will pick
up as a result.
When contact b of relay 2RTF
to energy of relatively high value so that if that
45 end of the track section is not occupied, the ap
proach relay will not respond to energy of the
value supplied as a result of high battery voltage
or low ballast resistance, or vas .a result of both
conditions, but so »that Athe approach relay will
be certain to respond if that end of the track
section is occupied.
As a result this method of controlling the di
rectional stick relay insures that the relay will
picks up it establishes the circuit for supplying
be picked up to cause coded energy to be supplied
energy to the primary Winding of transformer
ZDT with the result that a pulse of energy of 55 to the track stretch behind a train when release
of a code detecting relay is caused by occupancy
small value is induced in the transformer second
ary winding and is supplied therefrom to relay
of a track section, and at the same time it 1in
sures that Variations in operating conditions will
ZRH. When relay ELCT releases, and the supply
not cause a directional stick relay to be improper
of energy to relay ZRTR is cut off, the circuit
previously traced for energizing relay 2RTP is 60 ly picked up when release of a code detecting .re
lay occurs because the supply of coded energy
established, and relay ZRTP picks up, thereby
over the rails of a track section is cut off for the
causing a pulse of energy of normal value to be
purpose of deenergizing the track circuit ap
supplied through transformer ZDT to relay ZRH.
paratus.
After a comparatively long time interval, relay
2RTF releases, thereby interrupting the supply of 65 Myinvention is advantageous in that no con
energy to the primary winding of transformer
trol _pulse need be transmitted from the loca
tions at each end‘of the single track block to an
2DT and causing the release of relay ZRTP. At
this time a pulse of energy of small value is sup
intermediate signal location, ,or from »one inter
plied through transformer 2DT to relay ZRH.
mediate signal location to another, to cause the
These pulses, however, are of such value and are 70 system to assume its deenergized condition. If
the supply of coded energy from battery ZRTB,
separated by such time intervals as to be ineiîec
for example, is interrupted during a time when
tive to pick up relay ERI-I. Accordingly, the op
the-system is set up fortrafñc to move fromright
eration of the apparatus when returning to the
to left, if no train is occupying the sectiondeenergized state is such that false operation of
the'controlled signals cannot result.
75 ZR-AELT, >the equipment at the intermediate vsig
2,507,717
15
nal location BL--GR will assume its deenergized
condition, as previously explained, and Will cut
off the supply of coded energy to section
6R-4LT, to thereby cause the release of the re
16
relay having contacts movable between a nor-f»
mal and an operated position, means responsive
to picking up of the contact of said auxiliary
relay for moving the contacts of said directional
lays 4LH and 4LD at the other end of the single
track block.
An additional advantage which is gained from
relay to their operated position, means respon
this arrangement is that it causes all of the op
rectional relay to their normal position, and
sive to picking up of the contacts of said slow re
lease relay for moving the contacts of said di
means effective when the contacts of said direc
block to assume the stop position in case a train 10 tional relay are in their operated position or the
contacts of said slow release relay are picked up
overruns the entering head block signal at the
for supplying coded energy to the rails of said
exit end of the block. If a train moving from
second track section.
left to right should pass signal 2BA at a time
2. In a coded track circuit signaling system,
when signals 6L and dLA are cleared for a train
posing signals governing traffic in the single track
movement from right to left, the entrance of the 15 in combination, a stretch of railway comprising
adjoining ñrst and second track sections, means
overrunning train into detector section IT will
for at times supplying coded energy to the rails
cause relay ITR to release with the result that its
of said ñrst section at the end thereof remote
front contact a interrupts the circuit for relay
from said second section, a code following track
ZRCT. Accordingly, the supply of coded energy
relay connected across the rails of said ñrst track
to section ZR-GLT is cut off, and as previously
section at the end thereof nearest said second
explained, the equipment at signal 6L and also
at signal ALA is restored to its deenergized con
section, a slow release relay energized as a result
dition With the result that the signals indicate
of operation of said track relay, means operative
stop,
The equipment operates in a manner similar
to that described in the foregoing when the single
track block is conditioned for traflic movements
from left to right, when a train moves through
the stretch from left to right, and when the
system is being deenergized, and a detailed de 30
upon release of said slow release relay for mo
mentarily connecting a battery and the winding
of an auxiliary relay in series across the rails
oi said ñrst track section at the end thereof
nearest said second track section, said auxiliary
relay having a normally released contact which
becomes picked up or remains released accord
ing as the energy supplied through the winding
scription of the operation of theequipment is
of said auxiliary relay is of the value which is
deemed unnecessary.
supplied when the portion of said first track sec
It is to be understood that although only one
tion nearest said second track section is occupied
set of intermediate signals, GL and 6R, are shown
in the drawings, the invention is not limited to 35 or is of the value which is supplied when the por-,
tion of said first track section is vacant, a direc
this arrangement and any number of interme
tional stick relay having normally released con
diate signals may be provided as necessary. Ad
tacts, a pick-up circuit for said directional stick
ditionally, the conventional cut sections and
relay established when the contact of said aux
hand-operated track switches equipped with
electric locks may be interposed as desired with 40 iliary relay picked up, a stick circuit for said
directional stick relay including a front contact
out affecting the operation of the arrangement
of said directional stick relay and interrupted
of equipment embodying my invention.
when said slow release relay picks up, and means
Although I have herein shown and described
effective when the contacts of said directional re
only one form of coded track circuit signaling
system embodying my invention, it is to be under 45 lay are picked up or the contacts of said slow re
lease relay are picked up for supplying coded
stood that various changes and modifications
energy to the rails of said second track section.
may be made therein within the scope of the
3. In a coded track circuit signaling system for
appended claims without departing from the
a
stretch
of single track railway comprising ad
spirit and scope of my invention.
joining
ñrst
and second track sections, said first
50
Having thus described my invention, what I
track section having at the end thereof nearest
claim is:
said second track section a transmitting relay
1. In a coded track circuit signaling system, in
having contacts which normally occupy a ñrst
combination, a stretch of railway comprising ad
position and are movable therefrom to a second
joining ñrst and second track sections, means
position, said transmitting relay contacts being
for at times supplying coded energy to the rails 55 operative ywhen in their ñrst position to eifectively
of said first section at the end thereof remote
connect the winding of a code following track
from said second section.v a code following track
relay across the rails of said first track section
relay connected across tlie rails of said first
and being operative when in their second position
track section at the end thereof nearest said sec
to
connect a track battery and the winding of a
ond section, a slow release relay energized as a 60
code following approach relay in series across the
result of operation of said track relay, means
rails of said first track section, said signaling
operative upon release of said slow release relay
system including a signal governing entrance of
for momentarily connecting a battery and the
traffic into said second track section from said
winding of an auxiliary relay in series across the
rails of said ñrst track section at the end there 65 ñrst track section and having means governed by
traffic conditions in said second track section for
of nearest said second track section, said aux
governing said signal and for at times operating
iliary relay having a normally released contact
the contacts of said transmitting relay between
which
cordingbecomes
as the energy
pickedsupplied
up or remains
through
released
the Wind
their two positions, said signaling system also
ing of said auxiliary relay is of the value which 70 including means for at times supplying coded
energy to the rails of said ñrst track section at
is supplied when the portion of said first track
the end thereof remote from said second track
section nearest said second track section is oc
section, a iirst and a second slow release relay
cupied or is of the value which is supplied when
which are picked up in response to operation of
the portion of said ñrst track section nearest
said second track section is vacant, a directional 75 said track relay, said second slow release relay
2,507,717
17
18
remaining picked up for a time interval subse
supplied when the portion of said track section
quent to release of said first slow release relay on
at that end of the section is vacant or is of the
cessation of operation of said track relay, means
value Iwhich is supplied when the portion of said
track section at that end of the section is occu
effective when the contacts of said first slow re
pied, and means responsive to picking up of one
lease relay are picked up for supplying coded
of said auxiliary relays for supplying energy to
energy to the rails of said second track section
the associated directional stick relay.
at the end thereof nearest said first track section,
5. In a coded track circuit signaling system
an approach repeater relay effective when ener
gized to establish a circuit for a lamp of said
for single track railroads, a stretch of single track
signal, and a directional stick relay effective when 10 divided into a plurality 0f track sections with a
picked up to cause coded energy to be supplied to
head block signal at each end for governing trañ‘lc
the rails of said second track section at the end
in opposite directions into said stretch and with
thereof nearest said ñrst track section while said
intermediate signals located at intervals in the
first slow release relay is released, the combina«
stretch, code transmitting means and a code fol
tion with the foregoing apparatus of im-proved 15 lowing track relay associated with each end of
means for governing said approach repeater and
each of said track sections, decoding means re
directional stick relays by said code following
sponsive to the coding operation of each track
approach relay, said means comprising means
relay for governing the indication of the asso
effective according as said second slow release
ciated signal, each of said decoding means except;
relay is released or is picked up to condition said 20 those at the extreme ends of the stretch being
code following approach relay to pick up in re
effective when energized to cause operation of
sponse to energy of the value which is supplied
the code transmitting means for the adjacent
through the relay winding when a train is present
end of the adjoining track section, manually con
in said _ñrst track section within a substantial
trolled means for each end of the stretch for
distance of the end of said track section nearest 25 rendering the associated code transmitting means
said second track section or to pick up only in
response to energy of the value which is supplied
active and thereby cause transmission of code
pulses over the track rails of the successive track
through the relay winding when a train is present
sections toward the opposite end of the stretch
in said ñrst track section within a relatively short
for preparing the stretch for one direction of train
distance of the end of said track section nearest 30 movement, each of said intermediate signals hav
said second track section, a circuit including a
ing associated therewith a code following ap
front contact of said code following approach
proach relay responsive to the Kcode pulses which
relay for supplying energy to said approach re
peater relay, and means responsive to picking up
are supplied to the adjacent end of the adjoining
track section, each of said approach relays having
of the contact of said code following approach 35 a normally released contact which becomes picked
relay while said second slow release relay is
up when the code pulses supplied to the associated
picked up for supplying energy to said directional
track section are of the value which are supplied
stick relay.
when a train advances in said section within a
4. In a coded track circuit signaling system for
relatively long distance of said approach relay,
a stretch of single track divided into track sec 40 each of said approach relays being effective when
tions, said signaling system comprising code
its contact is operated to energize a slow release
transmitting means and a code following track
repeater relay which when energized establishes
relay associated with each end of each of said
track sections, decoding means responsive to the
a circuit for a lamp of the signal with which the
approach relay is associated, each of said inter
mediate signals also having associated therewith
a normally released directional stick relay effec
coding operation of each track relay except those
for the extreme ends of the stretch for governing
the operation of the code transmitting means for
tive when energized to cause operation of the code
transmitting means for the adjacent end of the
the adjacent end of the adjoining track section,
manually controlled means for each end of said
adjoining track section, the combination with the
stretch for rendering the associated code trans
foregoing apparatus of improved means for con
trolling the pick-up circuits for said directional
stick relays, each of said means comprising means
mitting means active and thereby cause trans
mission of code pulses over the track rails of the
successive track sections toward the opposite end
of the stretch for preparing the stretch for one
direction of train movement, and a directional
stick relay associated with each of said track
relays except those for the extreme ends of the
stretch and effective when energized to cause
operation of the code transmitting .means for the
adjacent end of the adjoining track section, the
combination with the foregoing apparatus of im
proved means for picking up said directional
stick relays when and only when release of the
associated decoding means is caused by entrance
into the corresponding section of a train moving
in the established traino direction, said means
comprising means effective upon release of the
code detecting means at an end of a section to
momentarily connect in series across the rails of
the associated section at that end of the section
a source of current and the winding of an aux
iliary relay having a contact which remains re
leased or becomes picked up according as the
energy supplied from said source through said
auxiliary relay winding is of the value which is
effective on release of the decoding means govern
ing an intermediate signal to momentarily con
55 nect across the rails of the section with which the
decoding means is associated the code following
approach relay associated with that end of said
section and during this period rendering said code
following approach relay responsive only to
60 energy of the value which is supplied through the
relay ‘winding when the portion of said section
within a relatively short distance of said code
following approach relay is occupied by a train.
65
ARTHUR L. JEROME.
REFERENCES CITED
The following references are of record in the
file of this patent:
70
UNITED STATES PATENTS
Number
Name
Date
2,344,573
Van Horn ________ __ Mar. 21, 1944
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