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Патент USA US2129182

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Sept. 6, 1938.
Filed April_ 4, 1929
9 Sheets-Sheet 2
Sept. 6, 1938.
Filed'April 4, 1929
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Filed April 4, 1929
9 Sheets-Sheet 5
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Filed April 4, 1929
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Sept. 6, 1938.
Filed April 4, 1929
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Sept‘. 6, 1938.
' Filed April 4, v1929
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Patented Sept. 6, 1938
Neil D. Preston, Rochester, N. Y., assignor to
General Railway Signal Company, Rochester,
N. Y.
Application April 4, 1929, Serial No. 352,558
71 Claims. (01. 246-3)
This invention relates to dispatching or cen
tralized control systems for enabling an operator
or dispatcher to control the movement of switches
and signals over an extended territory, subject to
5 the protection of a suitable block signal system,
so as to facilitate and expedite train movement,
the invention being more particularly directed. to
a system of communication to and from the dis
patcher’s office for obtaining the necessary indi
10 cations and controls.
In a dispatching system, it is essential that the
dispatcher or operator be advised of the move
ment of trains in the territory under his super
vision. This may be done by transmitting to the
15 dispatcher’s o?ice an indication, commonly
known as an OS indication, when a train passes a
known distant point, that is, when a train enters
and leaves a track section. Since the movement
of trains may be such as to require a transmis
20 sion of a number of such OS indications at the
same time, it is desirable to embody a communi
cation system of the so-called synchronous type
as distinctive from a code type.
In the synchronous type communication sys
25 tem, to which the present invention relates, the
controls and indications to and from the dis
patcher’s o?ice are transmitted over channel cir
cuits, automatically set up in rapid sequence over
a signal or message line and a common wire be
30 tween the dispatcher’s of?ce'and several control
points along the track, the indications or controls
being transmitted sequentially by the energiza
tion or de-energization of these channel circuits
from sources of current located at the dispatcher’s
ohice or at the distant control points. Such a syn
chronous type system, using rotary selectors or
distributors, is shown and described, for example,
in my prior Patent No. 2,082,462 granted June 1,
1937 on an application filed June 16, 1927.
In the synchronous type of communication sys
tem, since the channel circuits must be set up one
at the time in sequence, with each channel cir
cuit maintained for such time as is required to
transmit the desired indication or control, the
45 total time cycle for setting up all of the channel
circuits for the dispatcher’s territory is increased
as the system is extended to include more channel
circuits for a greater number of controls or indi
cations. Since a given channel circuit is set up
50 only once in this total time cycle, it will be evi
receiving an OS indication seriously handicaps
the dispatcher in obtaining e?cient and expedi
tious movements of trai?c. For these reasons,
it is desirable to limit the setting up of the chan
nel circuits of the synchronous type selecting sys
tem to those actually required to transmit a new
control or indication.
Under ordinary conditions of handling railway
tra?ic, the dispatcher is frequently able to deter
mine in advance the location_ in his territory 10
where train movements are likely to occur next
which will require him to make a change in the
position of switches or indications-of signals; and
it is desirable that the dispatcher should be able
at will to con?ne the channel circuit selection to 15
a particular place or part of the territory under
his supervision, so as to obtain quick response to
lever manipulation and prompt OS indications.
In thus restricting the operation of the communi
cation system to a selected portion of his territory,
the dispatcher of course for the time. being is
out of communication with the rest of the terri
tory; but under the circumstances existing when
the dispatcher manually restricts the channel cir
cuit selection to a selected portion of the territory,
he will not be interested for the time being in OS
indications from the rest of the territory, nor
desire to control any switches or signals at other
With these and other conditions in mind, it is 30
proposed in accordance with the present inven
tion to provide a communication system of the
synchronous type in which communication is es
tablished between the dispatcher’s office and each
of several stations or other divisions of the dis
patcher’s territory one at a time in turn by sec
tionalizing the system into stations or correspond
ing divisions, and transferring the communication
to the dispatcher’s o?ice from section to section
in turn. Another feature of the invention is that
the channel circuits for these stations or sections
are set up only as required to transmit a new in
dication or control. Also, in accordance with this
invention, the system is organized so that the
dispatcher, by a simple manual manipulation, 45
may restrict the channel circuit selection to a
given selected station at any time and for as long
as he desires.
a control or indication; and in many instances
In accordance with this invention, the channel
circuit selection at the several way-stations, and
also preferably in the dispatcher’s office, is ob
tained by groups or series of sequentially operated
neutral relays, such neutral relays for channel
in the handling of traf?c, too great a delay in
circuit selection being advantageously employed
dent that the greater the time of this cycle, the
greater is the possible time delay in transmitting
55 obtaining a response to 2» lsvel mQvtment 9;‘ in
with sectionalized communication or station se
lection, because the number of such relays re
quired at each station need be no more than nec~
essary to set up the channel circuits for that
particular station.
Other characteristic features, functions and
lishing the necessary inter-connection between
the groups of channel selecting relays, and other
devices of the dispatcher’s of?ce equipment, and
for transferring communication from the dis
patcher’s of?ce to each station in turn; an im
pulse producing means, preferably in the form
of relays, for providing the necessary impulses for
causing the sequential operation of the groups
of channel selecting relays as required; and vari
ous other relays and auxiliary circuits for pro 10
advantages of the system of this invention will in
part be apparent as the description progresses,
and will in part be pointed out from‘ time to time
as the proposed structure and mode of operation
of the system are explained.
As illustrative of one speci?c embodiment vv'o‘f 1:? viding automatic starting and stopping of the
the invention, there is shown on theaccompany-h system, manual station selection, and other func
ing drawings a typical organization of devices tions.
and circuits, constituting the equipment for the
'A‘s' representative of the track diagram, there
dispatcher’s oflice and the way-stations, for‘ the
shown‘in Fig. 1A 'a'single passing siding S,
application of the system to a single track rail
with a lamp 6 located near each endrto indicate,
road; but it should be understood that the sys
when lighted, that'there is a train present on
tem may be employed for the control of switches, the usual short detector track circuit at the cor—
signals or other devices, and'for the indication of responding end of ‘the corresponding siding in
the operation of such devices or train movements, ' the I?eld. In practice, this diagram of course
in various other ways. The parts and circuits are comprises a large number of stretches of track,
shown in the drawings diagrammatically, with either single or double,,with passing siding, cross
certain conventional illustrations,‘ more with the overs, and the like, according to the character
object of making it easy to understand the .prin
of the railroad in the territory under the super—
ciples and mode of operation of the system, rather vision of the dispatcher; and the lamps 6, to
than for the purpose of showing the particular gether with the means for controlling them, are
constructions or arrangements preferablyadapted duplicated to provide for the desired OS indi
in practice.
cations at the various points in the control ter
In the accompanying drawings, Fig. 1A and ritory. Similar lamps, when properly controlled
Fig. 1B illustrate the equipment in the dis
over a corresponding channel circuit, may be
patcher’s o?ice; Fig. 2A shows the equipment used to indicate the position of the distant
at the station A nearest the dispatcher’s o-f?ce; switches or signals, or to communicate to the
Fig. 2B shows certain parts of another station B dispatcher any other desired information.
and the station Z farthest from the dispatcher’s
Each of the OS lamps 6, as shown in Fig. 1A,
o?ice; Fig. 3 shows certain parts and circuits, is controlled by an OS relay 1 of the polar type
partly in the dispatcher’s of?ce and partly at having a dead-beat armature 8 retained in one
one of the stations, which are involved in auto- or the other extreme position, depending upon the
matically starting the system into operation; Fig.
4 shows the line circuits and relays involved in
establishing communication with one station at
a time, these parts and circuits being shown in
the condition which they assume when the sys
tem is sectionalized; Fig. 5 illustrates the parts
and circuits, partly in the 'dispatcher’s o?'ice and
45 partly at a station, which relate to the testing to
determine if channel circuits have to be set up
for that particular station to transmit a new
OS indication or control; and Figs. 6 and 7 show
modi?ed forms of the line circuits and relays for
sectionalizing the system. '
Fig. 1A above Fig. 1B is intended to show the
arrangement and organization of the equipment
for the dispatcher’s o?ice; and Figs. 2A and 2B,
placed end to end, are intended to show how the
system is arranged to include the station equip
ment. A complete system involves duplication of
many of the parts and circuits shown, depending
upon the number of stations involved; as will
readily be apparent as the description progresses.
Equipment at the dispatcher’s o’?‘ice-At the
central control station, conveniently termed the
said source, marked (+), over wire l3, through
lamp 6, wire M, back contact 15, of the relay l6,
and wire I‘! to the bus l2, so that the lamp» 6
is intermittently lighted as the cam 9 rotates 60
and energizes the bus l2.
When the dispatcher
in position to be attracted and held by the relay
IS, the lamp 6 is energized steadily in series with
the relay l6, and with reduced brillancy, due to
the additional resistance of the relay IS in the
several stations; a plurality of channel select
ing devices, one for each station, preferably in
the form of a group or bank of neutral relays; a
power operated rotary circuit controlling device,
75 conveniently termed astation selector, for estab
H to intermittently connect one terminal of a
source of current, marked (—~-), to a bus 12.
When the OS relay 7 is energized with the cor
rect polarity, assumed to be negative, its con
tact ?nger 8 assumes the dotted line position,
establishing a circuit from the other terminal of
patcher is stationed, the equipment comprises in
_ tion of the switches, signals, and other devices, at
on the track diagram which may be lighted, pro
vision is preferably made so that the lamp 6 is
intermittently lighted or ?ashed, until the dis 45
patcher pushes a button, whereupon the lamp
shines steadily with reduced brilliancy, until auto
matically put out. For this purpose, a cam 9,
rotated by a small electric motor 10, or other
suitable means, operates a spring contact ?nger 50
pushes a button l8, and moves the armature IS
the track layout of the territory under the super
vision of the dispatcher, with small electric lamps
or other indicators to register the OS indications;
a series of manually operable levers, by means of
which the dispatcher is able to control the opera
polarity of current last ?owing through the wind
ing of this relay. In order that the lamp 6, when
?rst lighted and until recognized by the dis
patcher by a manual manipulation, may be
readily distinguished from all the other lamps
dispatcher’s o?ice, where the operator or dis
general a suitable track diagram or model board of
When the OS relay 1 is operated to re
turn its contact ?nger 8 to the normal position,
the lamp 6 goes out and the relay I 6 is de
energized, permitting its armature I5 to return
to the normal position.
As representative of the levers manually oper
able by the dispatcher, there is shown in Fig. 1A
a lever L, arranged to be moved up and down to
either of the two extreme positions, this lever 75.
being intended to be used for the control of the
power operated switch at the'gend‘of the siding
just above‘ this lever; Another lever LS, mov
able from an intermediate or- middle position, as
shown, to the right or left, to either of two ex
treme positions, is intended to be used for con~
trolling the signals at the corresponding end of
the distant siding, and selecting the direction in'
which tra?ic may be permittedto move at that
end of the siding. The various levers in the dis
patcher’s of?ce are identi?ed with the corre
sponding portions of the track diagram by posi
tion, number, or the like.
The levers L and LS, and all other levers in
15 the dispatcher’s office, are each provided with
contacts which are normally closed during the
movement of such lever from its existing posi
tion to some other operated position. In the
simple form diagrammatically shown, a switch
20 arm 20 is suitably connected to the lever L so
as to move therewith, and engages a contact 2|
momentarily as this lever is moved from one
extreme position to the other.
Similarly, the
other lever LS has connected thereto a switch
25 arm 22, arranged to engage contacts 23 momen
tarily, whenever this lever is‘ shifted from any
existing position to another operatedposition.
The levers L and LS are arranged to make
and break contacts for the control of their re~
spective devices; and in the diagrammatic ar—
rangement shown, the lever itself carries in
sulated contact pieces 24 for connecting contacts
indicated as arrows. In the case of the lever LS,
which has three operated positions, a cam 25,
movable with the lever, is arranged to‘ engage a
roller on a spring contact ?nger 26 and shift it
to one position, as shown, when said lever is in
its middle position, so as to engage a contact,
illustrated as an arrow, and to allow the ?nger
fro/26 to move to the other position and engage an
other cooperating contact, also indicated as an
arrow, when said lever is in either of its ex
treme positions.
Referring to- Fig. 1B, the rotary circuit con
45 troller of the station selector SS, in the simpli
?ed form shown, comprises a shaft 30, indicated
by dot-and-dash lines, which is arranged to be
driven by suitable electric motor 3| through a
friction clutch‘32. It is contemplated that the
motor 3! is constantly operating, tending to drive
‘ the'shaft 3!], and that the clutch 32 slips while
the shaft 30 is held stationary and the system
is at rest. This is merely a typical arrangement,
and various other devices may be employed for
,0, driving the shaft 30.
The rotation of the shaft 38 is controlled step
by-step by a suitable escapement device, which
as. shown comprises an escapement wheel 33,
having teeth spaced around its periphery, cor~
responding to the number of stations of the sys
tem. The space between two successive teeth
represents a movement of the shaft 30 from one
station position to the next, this constituting one
full step‘ of the escapement wheel 33. The escape
ment wheel 33 is advanced one-half step at a
time by the operation of suitable detent devices
34 and 35, actuated by stepping magnets 36 and
31 from the spring held engaging position. Upon
energization of the stepping magnet 31 and re
, traction of the detent 35, the shaft 33 may rotate
clockwise, in the direction shown by the arrow,
one-half step, where it is stopped and held by
the other detent 3E; and upon energization of
the other stepping magnet 33 and retraction of
75 ‘a the other detent 34, the escapement wheel 33
and shaft 30 advance anotherhalf step, making
one full complete step.
Fixed to the shaft 30 are contact arms 40,
M, 42, 43, and 44, arranged to engage stationary
contacts in different positions of the shaft. The
full step positions of these arms are shown in‘
dotted lines. These arms are connected to suit
able wires, these connections as shown being
direct, but in practice being made through suit
able slip rings. These arms are of course in 10
sulated from each other. Also ?xed to the shaft
39 is a cam 45, which is arranged to operate a
spring contact ?nger 46 to open and close a cir
cuit in different positions of the shaft, as here
inafter explained.
In the dispatcher’s of?ce, for each station of
the system, there is a group of relays and other
devices, which are the same for each station,
so that a description of one will serve for all.
This group of devices for each station comprises 20
a bank of neutral relays for the selection of the
channel circuits for the corresponding station.
One bank of such relays l, 2, 3, and 4, is shown
in Fig. 1B, as representative of the channel cir
cuit selecting relays for station A. There will be 25
as many of these channel circuit selecting relays
as required for the number of channel circuits
for the corresponding station. Associated with
these channel selecting relays for each station
is a lever relay LV, a test relay TS, and a man
ually operable circuit controller K.
The equipment in the dispatcher’s o?ice also
includes a line relay LR, a channel circuit im~
pulse relay CI, with two associated relays 48
and 49; a starting relay ST; and a transfer re
lay TR, with itsassociated slew pick-up‘ relays
50 and 5|.
The system employs four line wires, compris
ing a common wire C, a signal or message line
SGL, a stepping line STL, and a transfer line 40
TRL, which extend from the dispatcher’s oflice
throughout the territory under the supervision
of the dispatcher and are connected to each of
the stations in the manner hereinafter explained.
As shown, the system is arranged to be oper 45
ated by direct current; and for this purpose suit
able batteries, motor generators, or other suit
able sources of current are employed.
One of‘
these sources of current, represented by the bat—,
tery 52 is used for energizing circuits wholly 50
local to the dispatcher’s office; and for simplicity,
the terminals of this source are identi?ed as (+)
and (—), and the local circuits are shown as
terminating at (+) and (—). The other source
of current, represented by the batteries 53 and 55
513, is employed for transmitting direct current
of opposite polarities over the line circuits to the
various stations; and for this purpose the mid
point of these batteries is connected to the com
mon C, and the other terminal of these batteries,
which are of opposite polarity, are identi?ed as
(13+) and (B—), the wires connected to these
terminals being for simplicity marked (3+) or
Station equipment-Fig. 2A shows the station
equipment representative or typical of the station
at one end of a passing siding PS.
other track lay-outs, with various arrangements
of switches and signals may of course be con
trolled by a similar station equipment, the equip
ment for station A, shown in Fig. 2A, is assumed
to be adapted to control the operation of a suit
able power operated switch machine and the
clearing of signals 55, 56, 51, and 51a, subject to
track circuit control, and also for transmitting to 75
the dispatcher’s of?ce an OS indication that the
usual detector track circuit at the end of the sid
ing, provided with a track relay T, is occupied
by a train. The operation of the switch machine
UK (not shown) is intended to be controlled to the
normal or reverse position by a dead-beat polar
relay 58, with suitable provisions for approach
and detector locking. The clearing of the signals
55, 56, 51 and 51a, subject to track circuit con
trol and the position of the switch, is determined
by the position of the dead-beat armature of. the
polar relay 59, the clearing of the particular sig
nals for opposite directions of traiiic being deter
mined by the position'of the dead-beat armature
15 of the polar relay 60. These relays 58, 59 and 89
are controlled over channel circuits from the
dispatcher’s o?‘ice, as hereinafter explained. The
way in which these relays control the operation
of the switch machine and signals may take vari
ous forms, such as shown, for example, in my
prior application, Ser. No. 199,325, ?led June 16,
, 1927, nowv Patent No. 2,082,462 granted June 1,
1937 or in the application of S. N. Wight, Ser.
No. 321,185,?led November 22, 1928, now matured
into Patent No. 1,889,457 granted November‘ 29,
The track relay T controls two neutral. relays
62 and 63, which are arranged to store up the
indication of the occupied or unoccupied condi
' tion of the detector track circuit, until such indi
cation has been transmitted to the dispatcher’s
of?ce, in a manner more easily explained in con
nection with the description of the operation.
- At each station is a bank of neutral channel
circuit selecting relays, corresponding in number
to those in the dispatcher’s o?ice. The channel
circuit selecting relays: for station A in Fig. 2A
are designated la, 21*, 3a, and 4e, and correspond
with relays I to 4 inclusive shown in Fig. 1B.
These two banks of relays, one in the dispatch
er’s oil‘ice, and one at the corresponding station,
are operated synchronously and sequentially by
impulses on the stepping line STL, to establish in
rapid sequence the channel circuits required to
transmit the desired control or OS indications
for station A. These channel circuit selecting re
lays at each station (see Fig. 2A) are controlled
by a line relay, as LRa for station A, of the polar
type, having its armature or contact ?ngers biased
to the middle or neutral position. The line relay
LR in the dispatcher’s o?ice is of the same type.
Also located at each station is a polar transfer
relay TR, having a dead-beat armature remain
ing in the position it was last put; a transfer
stick relay TRS, of the neutral type having two
windings; and a double-wound slow release relay
At each station is a suitable source of current
for energizing local circuits, and another source
for imposing di?erent polarities of currents be
tween the signal line SGL and the common Wire
C. These sources of current are preferably stor
age batteries, maintained trickle charged in a
suitable way, and are shown the same as for the
dispatcher’s o?ice as batteries 52, 53, and 54, with
the same symbols for their terminals and connec
tion to the common wire C.
The parts are shown in Figs. 1A, 1B, 2A, and
2B, in the normal or inactive position, with the
system at rest, ready to be automatically started
whenever it becomes necessary to transmit a
control or indication.
In this normal condition shown, in the dis
patcher’s o?ice (see Fig. 1B), the starting relay
ST, the transfer relay TR and the associated re
lays 59 and 5|, the channel impulse relay CI
and‘associated relays 48 and 49, and the step
ping magnets 36 and 31, are all de-energized.
The channel circuit selecting relays, as l, 2, 3,
and 4, the lever relays LV and the test relay TS,
for ‘each of the stations, are also de-energized.
The line relay LR in the dispatcher’s o?‘ice is also
de-energized. >
At each of the stations (see Figs. 2A and 2B),
the transfer relay TR is de-energized, but its con
tact ?ngers are held to the right, in the posi
tionto which they were last operated by a posi
tive impulse. The transfer stick relay TRS is 15
also de-energized. The slow release relay SL is
maintained energized by a stick circuit from (+)
through its front contact 66, wire 61, its lower
winding, wire 68, through back contact 69 of the
relay TRS, to negative (—).
The transfer line TRL is completed through
all the stations to the last station Z through the
back contacts ‘H of the several transfer stick re
lays TRS. The stepping line STL is also com
pleted through all of the stations, up the last 25
station, through the back contacts 12 of the sev
eral transfer stick relays TRS. As the last sta
tion Z (see Fig. 2B) the transfer line TRL is
connected to common C. The stepping line _STL
is open circuited at the last station.
The several transfer relays at the several sta
tions are connected in multiple between the trans
fer line TRL and common C through the upper
winding of the slow relay SL, this connection be
ing traced (see Fig. 2A) as follows:—from the 35
transfer line TRL, wire 13, relay TRa, wire 14
and 15, upper winding of relay SL, wire 16, back
contact 18 of the relay TRS, to C.
Starting.-The system is arranged so that it
is automatically set into operation either by the
movement of any lever in the dispatcher’s office
to a new operated position, or by the entering or
leaving of a train at any one of the detector track
circuits so as to cause a change in the position
of the corresponding track relay T.
In other 45
words, whenever a new control or OS indication
is to be transmitted, the system is automatically
set into
Considering ?rst how the system is automati
cally started upon a new lever movement, when 50
any lever in the dispatcher’s o?ice is manually
moved to a new operated position, the contacts
associated with that lever, such as 29—2l and
22-23 (Fig. 1A), are momentarily closed to en
ergize the corresponding lever relay LV. If the 55
lever L, for example, is the one which is moved
from the upper position shown to- the lower posi
tion, the closing of the contacts Zli-Zl during
this movement establishes a circuit from posi
tive (+), through contacts 20--2l, wires ‘l8, ‘l9, 60
and 89, relay LV to negative (—). The relay
LV, when thus energized momentarily, is main
tained energized by a stick circuit from negative
(—), through LV, wires 80 and BI, front con
tact 82 of the relay LV, wire 83, back contact 84
of the relay l, wire 85, back contact 86 of relay
2 to positive (+). This stick circuit is also
established through the front contacts 84 and 86
of the relays I and 2 and the wire 81, for reasons _
hereinafter explained.
Whenever any relay LV is energized, the clos
ing of its front contact 88 connects positive (+)
over wire 89 to the starting bus 90, which is
connected by wire 9| to the lower winding of
the starting relay ST to negative (—). Thus,
when any lever is operated to a new position,
the starting relay ST is energized, and is main
tained energized by a stick circuit from negative
through the lower winding of the relay ST,
wires 9| and 92, front contact 93 of the relay ST,
andstepping line STL are completed through the
several stations, and the ?rst step in the opera
tion is to break up or sectionalize the transfer
line ‘TRL and the stepping line STL, so that they
wire 94, and contact ?nger 46, operated by the
cam 45, to (+).
go only as far as the ?rst station A.
Upon energization of the starting relay ST, and
theclosing of its front contact II4, a circuit is
The starting relay ST may also be energized
to start the system into operation whenever any
track relay changes to a different position, Re
ferring to Fig. 2A, assume that the track relay T
is de-energized, by the entrance of a train into
a corresponding detector track circuit. The
dropping of the track relay T energizes the relay
15 62, over a circuit readily traced on the drawings;
and. as the relay 62 attracts its ‘armature, its
95 momentarily
close and establish a pick-up circuit for the relay
63. The relay 62, when picked up, is stuck up
through its front contact 96 and the front con
tact 97 of the relay 63. The relay 63, when picked
established for energizing the stepping magnet
31 (see Fig. 1B) from (+) through arm 4-0, wire
Hi5, front contact II4 of the relay ST, wires H6 10
and H1, stepping magnet 31 to (—). This re
leases the escapement wheel 33, and allows the
shaft 33 to turn clockwise, in the direction indi
cated by the arrow, one-half step, where the
switch arms GEL-M occupy the position midway 15
between the initial position and the ?rst dotted
line position. In this half-step position, a nega
tive impulse is applied to the transfer line TRL
up, is stuck up through a stick circuit from nega
tive v(—), relay 53, wire 98 and'99, front contact
I99 of relay 63, wires IOI and I32, back contact
I33 of the channel circuit selecting relay 3a to
(+). A stick circuit for the relay B3Hmay also be
established over wire IM and front contact I35
of the channel circuit selecting relay 4a, for rea
sons hereinafter explained.
The energization of the relay 63 in this way
closes its front contact I86 and establishes an
energizing circuit for the upper winding of the
starting relay, which may be traced as follows
(see Fig. 2A) :--starting at C, front contact I06,
of relay 63, wire I01, front contact I08 of the
relay SL, wire I09, contact Ili! of the transfer
relay TR,a in its right or positive impulse posi
tion, wire III and H2 to thesignal lineSGL,
thence to the dispatcher’s of?ce through arm 4|,
wire H3, upper winding‘ of the starting relay ST
to (3+). There is a similar starting circuit for
each station, which is closed if the relay 63 at
that station is-energized. The two windings of
the starting relay ST are, of course, so arranged
as to act cumulatively if both should happen to
be energized at the same time.
A starting circuit is established the same way
at any station, when the system is at rest, if the
track relay T at that station should happen to
pick up, due to movement of a train out of the
corresponding detector track circuit. Assuming
vi Ul
that the OS indication of occupancy of the de
tector track circuit has been transmitted, as
hereinafter‘ explained, so that the relay 63 has
been de-energized, the relay 62 is maintained en
ergized only by its pick-up circuit, while the
track relay T de-energized; and the relay 62 is
at once ole-energized when the train leaves the
detector track section and the track relay T
picks up to open its back contact. Upon such
de-energization of the relay 62, its make-before
break contacts 95 momentarily close to energize
the relay 63, which is stuck up as already de
scribed, and establishes the starting circuit
through its front contact I06, as just explained.
Inthis way, whenever there is any, change in
track circuit conditions, or any lever movement,
the starting relay ST is energized and the system
set into operation.
Sectionalizing.——The first step in the operation
is to sectionalize the system, so to speak, so that
communication is established between the dis
patcher’s office and the ?rst ‘station A. As above
pointed out, in the normal condition of the‘sys
tem when at rest, both the transfer line TRL
from (B—) over arm 44, wire F8, relay TB in
the tower, and wire II9 to the transfer line 20
TRL, and thence along this transfer line through
the several transfer relays TR at the various
stations in multiple. This negative impulse
through the ‘transfer relays TR causes the re
lays TR, TRS and SL to assume the positions 25
shown‘ in Fig. 4.
Referring to Fig. 4, the contact ?ngers of
thetransfer relays TR are all in the left hand or
negative impulse position. In this position a
local circuit is established from (+) through 30
the contact ?nger I20 of the relay TR to the
left, wire I2I, upper winding‘of the transfer stick
relay TRS‘ to negative (—). This energizes the
relay TBS which interrupts the stepping line
circuit‘STL at its contact 12 and the transfer
line circuit 'I'RL at its contact ‘II. The opening
of the back’ contact 69 of the relay TRS also
breaks the stick circuit for the relay SL, which
is de-energized, since its pick-up circuit is broken
at the backcontact 10 of the relay TRS. In this l
connection, it should be noted that the relays
TRS are made su?iciently slow in picking up that
each of the transfer relays TR will be energized
long enough to shift their contact ?ngers before
the transfer line TRL is broken up by the open
ing of the back contacts ‘II of the relays TRS.
At the ?rst station A, nearest to the dis
patcher’s oflice, the stepping line STL is con
nected to the line relay LR“ at that station
through the front contact 12 of the relay TRS 50
and wire I22 to common C, so that the line re
lay LR; in the‘dispatcher’s o?ice, and the line
relay LR? at station A are connected in series
over the stepping line STL and common. With
this stepping circuit for station A completed,
through the energization of the relay TRS at that
station, the stepping line circuit is energized with
a negative impulse to shift contact ?ngers of the
,two line relays to ‘,the left hand position, this
negative impulse being applied to the stepping
line STL (see Fig. 1B) from (3-) through back
contact I23 of the relay 49, wire I24, relay LR,
and wire I25 to thestepping line STL. The
reason for this negative impulse will be explained .65
After this operation of sectionalizing has been
completed, the slow pick-up relay 59, which has
been energized (due to the movement of the
contact ?ngerIZB -of the relay TB in the dis
patcher’s o?ice to the left) closes its front con
tact I21 and applied positive (+) over wire I28
to the bus I29 connected by wire I30 to the step
ping'magnet 36. The energization of the step
ping magnet 36 allows the escapement wheel 33 75
and shaft 30 to make another half-step, com
pleting the ?rst full step in the operation.
In this ?rst full step position of the shaft 30,
the stepping magnet 31 is again energized through
OT arm 46 and contact I3I, wire I32, and over wire
I I5 through the front contact .I I4‘ of the starting
relay, etc., as hereinbefore pointed out. This
energization, of the stepping, magnet 31 advances
the shaft 30 another one half-step, bringing the
10 parts-into the position shown in Fig. 5, which
corresponds to the position for testing or de
termining whether or. not channel circuits shall
be set up for the ?rst-station‘ A.
In this posi
tion, the cam 45 has disengaged the ?nger 46,
breaking the, stick circuit for the starting relay
ST; .but therelay ST does not release its arma
ture unless all of, the relays LV are then de
energized, which occurs at some subsequent point
in the operation of the cycle of the system when
20 all 'of the channel circuits have been cleared out,
as hereinafter
Test for channel circuit selection-For rea
sons?to be explained presently, it is desirable to
determine automatically; upon selecting each sta
25 tion, whether or. not there is any new control
or indication to be transmittedfor that station,
and thengo through, the operation of setting up
the;channel circuits only'if such new control
or indication is to be transmitted. For this pur
pose, a circuit, conveniently termed a test cir
cuit, is established between the dispatcher’s o?ice
and each station‘in- turn as it is selected, and
through; the medium, of this circuit, together ‘with
the condition .of the corresponding lever relay
35 LV, it'isaautomaticallydetermined whether or
not the individual channel vcircuits for that sta
tion shall be set up.
To-explain this feature‘ of’ the operation, as
sume-that, since :the system last operated and
40 cleared out all (of; the ‘channel circuits, either
alever for station:A wastop'erated to a new posi
tion, or that the ,‘track relay T at station Aih‘ad
picked up or dropped. Inveitherof these cases,
,there‘would be anew ‘control or OS, indication
to be transmitted, ‘and the individual channel
circuits at station A ‘should be set up.
. .Consider ?rst that a lever, such asL, for sta
tion A was operated to ‘a new position. , This
a circuit is established for energizing the chan
nel impulse relay CI as follows:—starting at
negative (-), relay CI, wire I5I to bus I52, wires
I53 and I54, front contact I55 of the relay LV, 10
wire I56, ?nger I59 of relay TS to the left, wires
I51 and I58, arm 40 in the half-step position
(see Fig. 5) to positive (+).
If it shoul'd'happen that there had been a
change in the condition of the track relay T at 15
station A, subsequent to the last clearing out of
the channel circuits at station A, then the ?nger
I48 of the relay 63 would be in the upper position,
energizing the relay TS positively, and thereby
energizing the relay CI directly over wire I59, in
dependently of the position of the contact I55 of
the relay LV.
Thus, whether there is a new lever operation,
or a change in the condition of the track relay
T, for station A, the channel impulse relay CI 525
is energized. This relay CI, when energized, '
maintained energized by a stick circuit individual
to each station, which may be traced from nega
tive (—) , relay CI, wires I5I, I60, front contact
I6I of relay CI, to bus I62, thence over wire I63,
back contact I64 of the channel circuit selecting
relay 4, wires I65 and I66, contact ?nger I61 of
the circuit controller K in the normal position,
' wires I68 and I58, and arm 46 to positive (+).
In this way, the relay CI is maintained energized 35
until the last channel circuit selecting relay,
which as shown is relay 4', is energized, or in
other words until the necessary number of step
ping impulses have been applied to the stepping
lineSTL to operate all of the channel circuit se
lecting relays.
Any suitable means may be employed to apply
positive and negative impulses to the stepping
line STL, upon energization of the. relay CI. As
shown, the energization of‘ the relay CI and the
closing of its front contact I16 energizes the re
lay 48 through the back contact I1I of the slow
lished as ,followsr-fstarting at C, relay TS, wire
I35, back contact I36, of channel circuit selecting
relay I, wire I31, back contact I38 of relay, 2,
wire I39, back contact I48 of relay 3, wire I4I,
back contact I42 of relay 4, wire I43, arm M
,asj’soon-as :the ‘shaft 30 of thestation selector
assumes the half-step position, shown in Fig. 5,
a test channel circuit through the test relay TS
in the dispatcher’s o?ice for station A is estab
lowerrpos'ition, energizing the relay TS over the
test channel circuit just traced negatively to
move the contact ?nger -I 58 of the relay TS to the
left, whereupon with the lever relay LV energized,
acting relay 49, and the closing of the front con
tact I12 of the relay 48 energizes'the slow acting
‘relay 49. After a time, sufficient for the slow
acting relay 49 to attract its armature, its con
tact ?nger I23 is raised to the upper position,
applying a positive impulse to the stepping line
STL ‘through the ‘line relay LR in the dispatch‘
er’s o?ice and through the line relay LR.a at sta- .
tion A, or such other station as may then be
energizes the relay 'LV for that'station'.
there had been no change in the track relay T at
station A, the ?nger I48 of the relay 63 is in the
on the shaft 30‘, to the signal line SGL, thence
to station A, wires H2 and -I44,'?nger I45 of
the relay LR‘? to the left, ‘wire ‘ I46, back con
As soon as the armature of the slow
acting relay 49 is attracted, the contact ?nger
I1I de-energizes the relay 48, which in turn opens
its front contact I12 and de-energizes the relay
tact I42a of channel circuit selecting relay 4“,
49. ‘After an interval of time required for the
wire I4Ia, back contact I4Il€1 of relay 3%‘, wire
I399, back contact I38a“of."“rel'ay '2“, wire I31“,
relay 49 to retract its armature, its ?nger I23
65 back contact I36a of relay Ia, wire I41, and con
drops and applies a negative impulse. This same
operation of picking up and drop-ping of the re
tact ?nger I48 of the relay 63 to 3+ or 3-, ac- ‘ ‘lays 487 and 49 ‘continues, and applies
cording to the‘position of this ?nger, and thence
back to
The contact?nger 145 of the ‘relay LR is in the
70 ‘left or negative impulse position to, complete the
circuit just traced, since the stepping line ‘cir
cuit STL is energized negatively, as above ex
_ 'On the assumption that alever for ‘station A
75 had been operated ‘to energize the relay LV, but
positive and negative impulses to the stepping
line STL, until the relay CI is de-energized,
whereupon ‘the relay 48 can not again pick up
upon dropping of the relay 49.
Channel circuit selection-The alternate posi
tive and negative impulses impressed upon the
stepping line STL cause the contact ?ngers II5
of’ the ‘line relay LR in the dispatcher’s o?ice,
Fig. '1B,‘and the contact ?ngers I16 of the line
‘relay at the station then in communication with 75
the ,dispatcher’s oi?ce, as the line relay LRa for
station A‘, to shift back and forth'from one ex
treme position to the other,-the position to the
right being, for convenience, assumed‘to corre
spond with a positive impulse. These two con
tact ?ngers H5 and I16 of these two line relays
are thus operated synchronously, since the re
lays are connected in series in the stepping line
circuit, and have the current built up in their
windings at the same rate, irrespective of the
length of the line circuit.
The movement of these contact ?ngers H5
and HE back and forth is used to energize se
Upon energization of the. relay 4, the opening
of its back contact I86 de-energizes
2 and 3. The energization of the
breaks at its back contact. I64 the
for the channel impulse relay CI,
the relays I,
relay 4 also
stick circuit
so that the
impulses on the stepping line cease.
In this way, the channel circuit selecting re
lays I-4 are energized sequentially one at a time.
The same operation of the relays Iii-4a at station
A takes place, except that the’ relay 4a at the
station is stuck up through its front contact 288“,
Wire 2| I, through the contact ?ngers 2I2 of the
transfer relay‘ TR, which is then in its negative
quentially the relays I-—4 and Iii-4a, which oper
15 ate their corresponding contact ?ngers simulta
or dotted line position as shown in Fig. 4, as a
result of the sectionalizing negative impulse, as 15
neously and synchronously, so as to set up in
rapid sequence a series of channel circuits for the
hereinbefcre explained.
transmission of the desired controls and indica
ployed by extending or duplicating the control
tions. The control circuits for these channel se
20 lecting relays I-—4 and lib-4a are the same, and
a description of these circuits for the relays I-—4
in the dispatcher’s o?ice will be sufficient.
Back and forth movement of the contact ?n
gers II5 of the relay LR alternately connects
25 (+) to the two bus wires a and b.‘ A positive
impulse on the stepping line circuit energizes
the bus a, and negative the bus b‘. The ?rst im
pulse on the stepping line circuit, upon energiza
tion of the channel impulse relay CI is positive,
due to the energization of the relay 49. This ?rst
positive impulse energizes the upper winding of
circuits as shown for the. relays I--4, the last
relay of the series being stuck up in the same way
as the relay 4. The number of relays required
would depend upon the number of channel cir
cuits required for the corresponding station.
Any desired control or indication may be trans
mitted over any one of the several channel cir
cuits set up by the channel circuit selecting relays.
These channel circuits may be energized with al
ternating current or direct current of different
the relay I over a circuit which may be traced
from bus a, wire I8I, upper winding of relay I,
wires I82; I83, I84 and I85, back contact I86 of
the relay 4, wire I81, to arm 42 of the station
selector shaft 39 in‘the position corresponding to
Although the bus
at is connected to the upper windings of there
lays I of the other groups of channel selecting
40 relays for the‘ other stations, the relay l for sta
tion A is the only one which is energized because
the energizing circuit for the‘other relays I is
‘ station A and thence to (—).
broken at the arm 42.
The relay I, when thus energized by the ?rst
- positive impulse on the stepping line circuit, is
maintained energized by a stick circuit through
its lower winding from (+), through its front
contact I88, wire I89, lower winding of relay I,
wire I98, to wire I83, and thenceto (-—) along
the same path through the back contact I86 of
relay 4 above traced.
On the next negative impulse, the bush is
energized, and this energizes the upper winding
‘of the relay 2 over wire I9I1,~front ‘contact I92 of
relay I, wire‘I98, upper Winding of relay 2, and
wires I94 and I95 to wire I84 and thence to (—)
over the same path above traced. The relay 2,
when thus energized, is stuck up through its front
contact I96 the same as the relay I.
The next positive impulse, energizing bus (1,
energizes the upper winding of ‘the relay 3 over
wire I91, front contact I98 of relay 2, wire I99,
upper winding of relay 3, and wires 209 and 2M
toithe wire I85 ‘and thence to (—). The relay 3
is similarly stuck up through its front contact 292.
Upon the next negative impulse, energizing the
bus 11, the relay 4 is energized over wire 203, front
contact 294 of relay‘ 3, wires-285 and 206, relay
‘4 direct to negative (—). The relay 4 is stuck up
through a circuitI which may be traced from
negative (—) through relay 4, wires 296 and ‘20?,
‘front contact 298 of relay 4, wires 209 and I66,
‘contact v?nger 1 I61 of switch K in the normal
closed position, wires‘ I68 and I58 to arm 40, in
the station A position, to plus (-1-).
It should be understood that any desired num
ber of channel circuit selecting relays may be em
polarities from sources either in the dispatcher’s -
office or at the station. As shown, the channel
circuits are employed to transmit positive or nega
tive direct current impulses to operate dead-beat
polar relays, but obviously other arrangements
could be employed.
I As typical of a channel circuit for transmitting
an indication from the station to the dispatcher’s
office, assume that the track relay T at station
A (seeFig. 2A), is tie-energized by the presence
of the train on the corresponding detector track 40
circuit, and that the relay 62 is also energized.
Then, when the channel circuit selecting relays
i and I3 are energized by the ?rst positive impulse,
a channel circuit for energizing the OS relay ‘I
for station A in the dispatcher’s office is estab
lished and may be traced as fol1ows:-—starting at
B+, front contact 2I4 of relay 62 (see Fig. 2A),
wire YZIB, front contact I36a of the relay Ia, wire
131a, back contact I38a'0f relay 28, wire I39a, back
contact I40EL of relay '3“, wire I4Ie, back contact 50
I42a of relay 4*‘, ‘wire I46, contact ?nger I45 of
relay LRA, now to the right (positive impulse
position), wires 2I6 and H2 to the signal line
SGL thence to the dispatcher’s o?ice (see Fig.
1B), to arm M of the station selector shaft 39,
in‘its. position corresponding to station A, wire I43,
back contact I42 of relay 4, wire I4I, back contact
I49 of relay 3, wire I39, back contact I38 of relay
2, wire I31, front contact I36 of relay I (now
energized), wire 2|‘! (Fig. 1B) to Wire 2AI'I of 60
Fig. 1A, OS relay 1 to the common wire C, and
thence back to the neutral terminal of batteries
53 at station A (see Fig. 2A).
Current ?owing over this OS channel circuit,
‘being of positive polarity, due to the energization 65
of the relay 62, shifts‘the contact ?nger 8 of the
OS relay 1 to the dotted line position, energizing
the OS lamp 6 intermittently in the manner pre
viously explained, until this indication is recog
nized by the dispatcher and button I8 is operated
to cause the lamp to burn steadily with reduced
The condition of ‘other track circuits, the posi
tion of switches or signals, or any other desired
.informationmay be transmitted from a station
to the dispatcher’s of?ce ‘in a similar way over a
_ relay TRS' completes the transfer ‘line circuit
channel circuit. _
As typical of‘the operation of transmitting a ’ TRL over to station'B, and thecontact ?nger ‘I2
connects the stepping line circuit STL to the line
control from the dispatcher’s o?ice to station A, relay
LRb at station B.
assume that the lever L (see Fig. 1A) is operated
between the
to the other position. Then,; upon energization
of the channel circuit selecting'relays 2 and 2a, 'dispatcher’s o?ice and the next station B; and
a channel circuit, similar to the one above traced,
is set up from (3-) over wires 2I8 and 2| 9 (see
Fig. 1A) to the front contact I 38 of the relay 2,
thence through the back contacts‘llltl and I42 of
the relays 3 and 4 to the signal wire, to station A
through the contact ?ngers I45 of the line relay
LRa (now in the left or' negative position),
through the back contacts I4221 and l I011L of the
relays IIEL and 3a, through. the front contact I 38a
of relay 21*, wire 229 to the polar relay 58 and
thence to C. This channel circuit being energized
negatively, causes the contact ?nger of the relay
58 to be shifted to ‘the other position, and in turn
operating the switch machine (not shown) to'the
other position.
In a similar way, the relays 59' and 60 at sta
tion A, (see Fig. 2A), may be operated to one
position or the other by the movement of the
lever LS (see Fig. 1A), so‘ as to permit one of the
signals 55-5‘!at to clear, subject to the presence
of trains ahead, dependent upon the position of
the switch and the direction of traf?c set up by
30 the extreme position to which the lever LS is
shifted. Any desired number of switches, signals,
derails, or other tra?'ic controlling devices may
be controlled ‘by the dispatcher at any given sta
tion in a' similar way.
Transfer to the neat station.-—After the chan
nel ‘circuits have been setup for station A, as
just explained, and upon energization of the last
relay, as 4,‘ of the group or'bank of channel cir
cuit selecting relays for station A, current is ap
plied through the front contact I64 of relay 4
over wire 2| 0 to the bus I 29, so as to energize the
stepping magnet 36‘and cause the station selector
shaft 30 to advance another half-step to the posi~
tion where the arms 50, 4|, 4'2 and 43 break con
tact, and the arm 44 makes contact.
Under these conditions, a positive impulse
from B+ is transmitted over arm‘ 44, wire I18
through the transfer relay TR; in the dispatcher’s
oi’?ce and through the'transfer' relay TRa at sta
tion A (see Fig. 2A). This positiveimpulse shifts
vthe contact ?ngers I20, 2-‘I2 and ll?of‘the trans
fer relay TRa from the left hand position shown
in Fig. 4 to the right hand position shown in
Fig. 2A. This movementof the contact ?nger
I20 breaks the energizingcircuit for the upper
winding of the transfer stick relay TBS, but so
long as this positive impulse exists, the contact
?ngers of this transfer relay TRS are held in the
raised or attracted position by the flow of current
60 over wires ‘I4 and 22I, through the lower wind
ing of this relay TRS, wire 222, andv through its
front contact 'II] to C. ‘After a time interval, su?i
cient for proper response of the transfer relay
TRa at station A, slow acting relay 5| in the dis
.patcher’s o?ice closes its front contact 223 and
energizesthe stepping magnet 37, thereby ad
vancing the shaft3Il a half-step, so as to break
as soon as the step-ping line circuit, including the
line relay LR in the dispatcher’s o?ice and the
line relay LRb in station B, is established, the
negative impulse on this line circuit, supplied 10
through the back contact I 23 of the relay 49
causes the contact ?ngers of these two line relays
to assume the left hand or negative position,
whereupon a test circuit, similar to the one here
inbefore traced for station A, is set up. If the
relay 63 at station Bis energized, due to the
picking up or dropping of the track relay T at
station B since the last 0g; indication was trans~
mitted, then the test relay TS in the dispatcher’s
o?ice for station B is energized to shift the con -20
tact ?ngers I59 to the right, so as to energize
the channel circuit impulse relay CI. Or, if any
lever for station B has been operated to‘a new
position, since the last clearing out of the con
trol channel circuits, the relay LV for station B 25
is energized. In this case, the channel circuit
impulserelay CI is also energized. Thus, if there
is a new control or OS indication for station B
to be transmitted, then the energization of the
relay CI applies alternate positive and negative 30
impulses to the stepping line circuit and operates
the channel circuit selecting relays, such as I--4,
at stations B and at the dispatcher’s o?ice, so as
to set up a series of channel circuits for trans
mitting such new indication or control.
Skipping stations-If it should happen that
channel circuits for station B. This applies to
all of the other stations in the same way.
This automatic holding; or skipping of stations
is an important feature of the invention. In the
?rst place, the channel circuit selecting-‘devices
are not operated,lunless required for the trans
mission of new indications or controls so that un
necessary wear on the parts is avoided. Further
more, the time required-to set up the channel
circuits, not needed to transmit a new control or
indication, is avoided, so that the total time cycle
for scanning, so to speak, the whole controlled
territory is greatly reduced, and makes it possible
to have a greater number of channel circuits on
a single set of line wires, or increase the time for
setting up each channel circuit, without obtain
ing objectionable or prohibitive delay in the
transmission of controls or OS indications.
To appreciate ,thesignificance of this feature
of the invention, it should 'be understood that,
contact at the ‘arm “,and bring. the other arms
40, III, 42 and 43 into ‘their ‘contacting position
under normal operating conditions and for such
for the next station'B.
When the arm 44 breaks its: contact, the posi
tive impulse on the transfer line TRL ceases, and
extended territoryof a single trackrialroad, it is 70
the» transfer stickrelay TRS at station A (Fig.
2A) releases its armature and allows its contact
75 ?ngers to drop; The contact ?nger “of this
there has been no change in the position of the
levers for station B, and no change in the condi
tion of the track relay T at station B, then the test
relay TS for station B in the dispatch-er’s o?ice
is energized with a negative impulse and its con 40
tact ?nger I50 assumes the left hand position,
and also the relay LV in the dispatcher’s of?ce
for station B is de-energized, so that current is
supplied to the stepping magnet 36 over wire 224
to advance the shaft 30 another half-step, with
out time being taken to set up the individual
density of tra?ic and'train movement‘ordinarily
encountered in practice; particularly over an
very rare that, within a given period of a few
seconds, there would be any new ;control or OS
indication to be transmitted from more than
about one station out of eightor; ten. For ex
ample, in an installation for twenty passing sid
ings, under What can be termed normal or aver
age operating conditions, it is rare that trains
would happen to enter or leave track sections at
the ends of more than two of these passing sid
ings exactly simultaneously, or within a limited
period of a few seconds, or that the dispatcher
will ?nd it necessary to operate a switch or sig-,
nal, within the same given period, at more than
10 one or two siding ends. In other words, out of
all of the channel circuits for the control terri
tory under the supervision of the dispatcher,
during a given period, it may be fairly assumed
that, most of theitime- at least, only some ten per
15 cent of the total channel circuits are actually
required for the transmission of a new control or
indication; and by eliminating the time required
to set up the channel circuits not needed, it will
be evident that the efficiency of the communica
20 tion system is greatly increased.
This may perhaps be made clearer by a speci?c
example. Assume, for instance, a single track
installation of twenty passing sidings, with a
station at each siding end, or a total of. forty
25. stations. It is found that it takes about one—
?fteenth of a second to set up and utilize a
channel circuit. The transfer from station to
station may be made effectively in about the
same time. It would require, therefore, let us
30 say, about one-eighth of a second to select the
station and set up the test circuit, making a
total time of about ?ve seconds to select and test
out all of the forty stations. Assuming each siding
end or station requires‘ four channel circuits, if
35. the channel circuits for only ten per cent of the
stations have to be set up, then the additional
.time for channel circuit selection is about one
second, making the total time cycle something in
the order of six seconds. On the other hand, on
the same assumption of four channel circuits per
40 station, forty circuits per station and a ?fteenth
of a second for each channel circuit, the addi
tional time required, if. all of the channel circuits
were set up, would be over ten seconds, making
the total time cycle a matter of ?fteenor more
seconds. Thus, it might happen that, after a
lever had been moved, or a track relay had
changed, there would be a delay of some ?fteen
seconds before there would be any response in
the ?eld to such lever movement or indication in
50 the dispatcher’s of?ce of change in track circuit
conditions. In many cases, such a delay would
very seriously handicap a dispatcher and inter
fere with the expeditious and efficient movement
of trains. This would be particularly true in the
55 case of a non-stop meet, or similar traf?c con
gestion at a particular point or zone.
Completing station selection.-—The same steps
of transferring from station to station, establish
ing the test circuit, and setting up the individual
channel circuits for such stations as may be re
quired, as above explained, continues until the
last station Z (see Fig. 2B) is reached. After the
setting up of the individual channel circuits at
this last station Z, or after response of the test
65 relay TS for that station, indicating no need for
the individual channel circuits, the stepping mag
net 31 is energized in the same way previously
explained, to advance the shaft 30 from the posi
tion corresponding to station Z one half-step,
70 bringing the arm 43 into the position, one-half
step short of. its initial position, and establishing
a circuit over wires 226 and 221 to energize the
transfer line TRL and the relays TR at the
751 several stations, without energizing the relay TR
in the dispatcher’s ol?ce. Also, the arm 42 in
this last half-step position establishes a circuit to
energize the slow pick-up relay 230, which closes
its front contact 23l after a time and energizes
the bus I129 for the stepping magnet 36, so that
the shaft 35) completes its last half-step and
reaches its initial position shown in Fig. 1B. The
time required for the relay 230 to close its front
contact 215i is so selected that the shaft 30 re
m 'ns in this last half-step position, and the 10
transfer relays TR. at the several stations are
maintained energized positively, for a period of
time long enough to cause the slow relay SL in
the several stations to pick up their armatures.
These slow relays SL, when thus picked up, are 15
stuck up through their front contact 66, wire 61,
lower winding, wire 68, and back contact 69 of the
corresponding relay TBS, as shown in Fig. 2A.
Thus, at the end of each revolution of the shaft
30, a long positive impulse is applied to the trans— 20
fer line TRL to pick up the slow relay SL at the
several stations. With the slow relay SL at each
station energized, and the contact I I0 of the re
lay TR at that station in the right or positive im
pulse position, the circuit vat that station for 25
starting the system into operation is made up, so
that when the relay 63 at that station is ener
gized, the upper winding of the starting relay
ST in the dispatcher’s o?ice is energized. The
branch circuit at each station for starting the 30
system into operation is broken at once at the
contact ill! of the relay TR by the negative sec
tionalizing impulse on the transfer line TRL, and
is maintained broken at the front contact I08
of the relay SL at that station, until the next 35
long positive impulse is transmitted at the end
of the revolution of the shaft 30. In this con
nection it should be understood that the positive
impulses applied to the transfer line TRL over
arm 44 to transfer a communication from sta
tion to station, are not long enough to energize
the slow relays SL at the several stations.
After the shaft 30 assumes its initial position,
as just explained, the system is ready for an
other operation. The transfer line TRL is com- 45
pleted through the several stations, so that when
the starting relay is energized and the shaft 30
advances one-half step, the ?rst negative impulse
on the transfer line TRL sectionalizes the sys
tem, as hereinbefore explained, and at the same 50
time de-energizes the slow relays SL at the
several stations to open the starting circuits at
all of the stations.
When the shaft 30 of the station selector
reaches its initial position after a revolution, it 55
may stay there until the system is set into oper
ation at some subsequent time, or another revolu
tion of the shaft 30 may be at once started, in
a manner which will now be explained.
Clearing out of the channel circuits.—It will
be evident that, during this cycle of operation of
thesystem, while communication was set up be
tween the dispatcher’s office and some intermedi
ate‘station, a lever might be operated, or a track
relay dropped, at some one or more of the sta 65
tions which had already been selected and at
which the individual channel circuits might have
been set up. Consequently, if the system should
stop at the end of this ?rst cycle or revolution
of the station selector, there could be some con 70
trol or indication which had not been transmitted,
and would not be transmitted until the system
was again set into operation by some new lever
movement or change of a track relay.
For these reasons, it is important to organize 75
the system so that, when once set into operation,
it continues in operation until all of the controls
or indications have been cleared out, so to speak.
There are several possible contingencies or cases
to be considered in this connection.
Assume ?rst that, after the system had passed
on to an intermediate station, say station B, a
lever is operated for some preceding station, say
station A, or the track relay T at some preced
ing station, as station A, has either dropped or
picked up due to a train movement occurring
subsequent to the selection of that station. When
such a new lever movement for station A oc
curred, the relay LV for that station was ener
15 gized, and stuck up through its stick circuit.
In the case of a change in the track relay T at
station A (see Fig. 2A), the relay 63 would be
energized through the make-before-break con
tact 95 of the relay 62, whether that relay was
20 energized or deenergized by the change in the
track relay T; and the relay 63 will be stuck up
through the back contact I03 of the relay 3“.
When the system completed its cycle of oper
ation under consideration, and the shaft 30 as
25 sumes its initial position shown in Fig. 1B, the
starting relay ST would be energized in either
case, in the same way as hereinbefore explained
in connection with the starting of the system
from rest, Consequently, another revolution of
30 the shaft 30 would occur.
In this way, the shaft
30 continues to rotate until, upon reaching its
initial position, all of the lever relays LV are de
energized, indicating that no lever has been op
erated since the transmission of controls had
35 been completed, and until the relays 63 at all
of the stations are de-energized, indicating that
no change in track circuit conditions has taken
place since the OS indications were last trans
Another contingency is that a lever may be op
erated for a station while the channel circuit
selecting relays are operating, and subsequent to
the setting up of the channel circuit for that par
ticular lever. To illustrate, referring to Figs. 1A
and 1B, suppose that, after the relay 3 has oper
ated, to break at its back contact M0 the channel
circuit over wire 2I9 to the lever L, this lever is
shifted to a new position. It will be evident, that
in such a case, it would be necessary to set up
again the channel circuits for station A, in order
to transmit the new control. For this reason the
stick circuit for the lever relay LV is so organized
that it is broken, to permit cle-energization of the
relay LV, at the back contact 84 of the relay I,
55 when that relay is energized, and before the relay
2 is energized. As soon as the relay 2 is energized,
then the stick circuit for the relay LV is com
pleted through the front contacts 84 and 86 of the
two relays I and 2, with the result that the move
60 ment of any lever thereafter would be registered,
so to speak, by the energization of the relay LV.
The relay LV is made slightly slow releasing, so
that if energized, with the I and 2 up, it does not
drop during the momentary opening of its stick
circuit upon simultaneous dropping of the con
tact ?ngers 84 and 86 of the relays l and 2, which
occurs when the relay 4 picks up. Since the ener
gization of the relay LV, as above explained, as
sures another revolution of the station selector
70 shaft 30, the channel circuits for the station A
under consideration are again set up, and the con
trol corresponding to the operation of the lever
L under consideration is transmitted in the regu
lar way.
A similar contingency may arise in connection
with the dropping or picking up of the track relay
T at a station. Considering station A, Fig. 2A,
the track relay T may happen to pick up or drop,
depending upon the movement of the trains into
and out of the corresponding detector track cir
cuits, at any time in the operation of the chan
nel circuit selecting relays Ia—4&. The OS chan
nel circuit is established through the front contact
I315a of relay la, and is broken through the back
contact I38a of relay 241. Since the OS indication
can not be transmitted except while this OS chan
nel circuit is set up, and since the train may enter
or leave the detector track circuit at any time, it
is necessary to make special provisions to assure
the transmission of the OS indication.
For one thing, the train may enter the track
circuit and drop the track relay T, and again
leave the track circuit and permit the track relay
T to pick up, before the OS channel circuit is set
up, as for instance, while the system is operating 20
at some other station or stations.
This condi
tion is likely to happen with short fast moving
trains or single locomotives or motor vehicles.
For this reason, provision is made by means of
the relays I52 and 63 to store up, so to speak, the 25
OS indication that the track relay T has dropped,
until such indication is actually transmitted to
the dispatcher’s of?ce. When the track relay T
drops, the relays 52 and 63 are picked up
stuck up in the manner previously explained,
remain stuck up even after the train leaves
track section and the track relay T picks
and 30
With the relay 63 energized, the closing of its
front contact let assures starting of the system, if
at rest, or another revolution of the station selec
tor shaft 30, if the system is operating. Also, the
closing of the front contact I48 of the relay 63
assures that a positive impulse will be transmitted
over the test circuit to assure that the individual
channel circuits will be set up for the station in 40
question when next selected, so as to transmit an
OS indication. Upon operation of the channel
circuit selecting relays at the station in question,
when the relay 3a picks up, it breaks at its back
contact I03 the stick circuit for the relay 63, which 45
releases its armature. As soon as the relay it3
picks up, the stick circuit for the relay 63 is again
established over another branch through the front
contact I05 of the relay 4a.
When the relay 83 drops, it breaks at its front
contact 9'! the stick circuit for the relay 62, and 50
if the trainhas left, the relay 62 is de-energized.
This relay 62, however, is made slightly slow act
ing so that, during the very short interval between
the breaking of one stick circuit for the relay 63 55
at the back contact I 03 of the relay 33 and the
making of another branch of the stick circuit at
the front contact I 95 of the relay 4a, the relay 62
will not release its armature, and will thereafter,
by closing its make-before-break contacts 95, 60
again energize the relay 63 momentarily and per
mit it to be stuck up. With the relay 63 thus
energized, another operation of the channel cir
cuit selecting relays I a—lla is assured to transmit
an indication that the track circuit is unoccupied, 65
the relay 62 being de-energized.
If at the time of the channel circuit selection
for the station in question, the train is still on the
detector track circuit and the track relay T is still
shunted, upon de-energization of the relay 63, as
just explained, it remains de-energized until such
time thereafter as the track relay T may pick up,
whereupon the same energization of the relay 63
occurs, and the same subsequent operation of the
channel circuit selecting relays la—4a, to trans
sponding to station A, and moves either the lever
mit an indication that the track circuit has be
come unoccupied.
L or the lever LS to a new position and then
returns such lever to its former position, which
If it should happen that the track relay '1'‘ at
operation is for momentarily closing the pick-up
‘ station A (see Fig. 2A) should drop during the
(circuit of the relay LV, as previously described.
short time the relays Iii-4a are operating, and The movement of the contact ?nger l?'l of key K,
after the OS channel circuit is broken by the from the position shown to the other extreme
energization of the relay 2a, the relay 63 is picked position, establishes a circuit for energizing the
up and stuck up in the same way, and assures a
relay LV for station A from plus (+), arm 40,
subsequent cycle of operation of the system.
wires I58 and I68, ?ngers I61, wires 233 and 80, 10
relay LV to negative (—), when the selector SS
into operation, continues to operate until all new has been operated to select the station A. If
controls or indications have been transmitted.
the system is at rest, this energization of the
During the transmission of a new control or in
relay LV starts it into operation. If the system
dication for any given station, all of the other is running and has passed the station in ques 15
controls or indications for that station are re
tion, it completes another cycle of operation.
peated, since all of the individual channel cir
In either case, upon coming to station A, the
cuits for that station are set up. Thisgives a
relay CI is energized, since the relay LV for
check on conditions at that station. This check
Station A is picked up, and the channel circuits
ing feature aids greatly in avoiding continued or. for station A are set up. When the last relay, as 20
4 is energized, the closing of its front contact 164
20 persistent false indication or control, as may
happen in other types of communication systems, does not energize the stepping magnet 36, be
such as the code type, where a control or indica
cause the ?nger l6‘! of the key K is shifted.
Similarly, the stick circuit for relay 4 is not es
tablished, and as soon as the negative impulse 25
on the stepping line circuit (which causes ener
gization of the relay 4) ceases, this relay drops,
making the bank of relays l-—4 ready for an
other operation. Since the relay LV is held up
through the key K, the relay CI is again ener 30
tion is transmitted only once and is not automat
ically checked until repeated or changed. The
dispatcher is able to obtain such check of the
conditions at any station by moving any lever for
that station over to a different operated position
and back again, the relay LV being energized by
such lever movement, and causing the channel
circuits for that station to be set up, also start
ing the system into operation, if necessary. If
desired, a special key may be provided to enable
the operator to energize at will the relays LV for
all the stations, so that he is able to check all
of the controls and indications, without making
a special lever manipulation for each station.
Manual station seZeoti0n.—-Under practical op
erating conditions, such as in making a non-stop
meet, it is often important that the dispatcher
should obtain an OS indication of the entrance
of a train into certain track sections as quickly‘
as possible, and should also be able to secure
prompt operation of a switch or signal in re
sponse to a lever movement. Thedispatcher is
ordinarily able to determine ahead of time the
particular siding, or other control point or zone,
where train movements are next likely to occur
which would necessitate prompt operation of
switches. and signals, since he is kept informed of
the train positions by the OS indications, and
knows the running time of the trains from point
to point.
Although the automatic skipping of stations, as
above explained, vhelps greatly in shorting the
total time cycle of operation of the system, and
aids in obtaining prompt response to track relay
changes or lever operations, there are critical
times when the dispatcher is not at all interested
for the time being in OS indications from the
various points along the track, where trains may
CO enter and leave track sections, and would be as
sisted in handling the traffic at some congested
point, if such unimportant OS indications were
discontinued, and the communication system 10
calized, so to speak, to the particular station in
which the dispatcher is then interested.
For these reasons, the system of this invention
is preferably organized so that the dispatcher
may, by a simple manual manipulation, con?ne
the channel circuit selection to some selected sta
tion for such period of time as hemay elect.
illustrative of this operation of manual station
selection, assume that the dispatcher wishes to
con?ne his attention for a while to station A. To
do this, he operates the key K, Fig. 1B, corre
gized, and the stepping impulses are continued.
In order that the relays Iii-4a at station A,
referring to Fig. 2A, may be operated the second
time, it is necessary to break the stick circuit
for the relay 4‘1 through the contact ?nger 2l2 35
of the transfer relay TRa, which is in its nega
tive or dotted line position, since the system is
sectionalized and station A selected. This is done
by applying a positive impulse to the transfer line
TRL over a circuit from (B+), arm 43 of the 40
shaft 3%} in the station A position, wire 234, hold
ing coil 235, ?nger 236 of key K (now closed), and
wire 23'! to the transfer line TEL. This. circuit
energizes the transfer relay TR,2L at the station A,
and all of the other relays for other stations 45
nearer the dispatcher’s 'o?ice, but does not ener—
gize the transfer relay ‘TR. in the dispatcher’s
office. ‘This causes the contact ?nger 2l2 of the
transfer relay TR,a at the station selected to move
to the right or positive impulse position (these 50
relays for stations near the dispatcher’s office
being already in that position), and break the
stick circuit for the relay 4%, so that the relays
Isl-43a may be repeatedly operated to set up the
channel circuits for that particular station se 55
quentially as long as the key K is operated.
Thus, the dispatcher may select manually any
station at which he desires the channel circuits to V
be set up continuously, and it is evident that any
change in the condition of the track relay at 60
that'station will be practically instantaneously
transmitted to the dispatcher’s o?ice, and simi
larly the signals and the switch at that station
respond very quickly upon movement of a lever
in the dispatcher’s office, since all of the channel 65
circuits for one station may be set up in a second
or less.
Consequently, the dispatcher is able to
put himself in direct and practically instantane
ous communication with any station he desires,
and is able to handle tra?ic‘at that station very
When the dispatcher is through with the sta
tion he has selected manually, he restores the key
K to the normal position. This sets up the nor
mal operating conditions, so that, when the last
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