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Патент USA US2124450

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A. G. sHAvER
2,124,450 ~
"TRAIN TELEPHONE SYSTEM FQR 'SIMULTANVEOU$ COMMUNICATIONS
Original Filed sept.V 19, 192s;
2 sheets-sheet 2 ‘
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'INVENÍOR
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f`TRAIN'
" TANEOUS
TELEPHONE
COMMUNICATIONS
SYSTEM FOR
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alcalina o'. shaver, chicago, m. '
Anuman mummia, loza. serial No. 306,905'
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_BcnewedFebrllary25, 1932
This invention relates to a system for carrying -
`on communication between »diilerent Pparts of `a.
railway train; between two railway trains operat
ing on the same track system; audbetween a
5 v` railway train and the wayside. More specifically
'
it admits of two or moreseparate and distinct
‘ _, sets oi' communications taking place atthe same
‘
time over the same general system, as for exam- .
ple:-_-Colnmunication may be carried on between '
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Figure 2 is a diagrammatic showing illustrative
of the circuitsand requipment on the track con
nected with the circuits and equipment in the
.wayside stations, for coordination with the train
carmenl sets luustr‘ated 1n Figures 1 and a.
5 l
Figure 3 illustratesthe usual arrangement oi
circuits and equipment for the head endo! a `
train.
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Figure 4 is another and o tional arrangement
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10 adis'patcher in his omce on the wayside and either - of circuits and equipment o dnf train. `
Figureô is a diagrammatic showing illustrative
¿ the conductor` or engineman, or both of them,`_on-
` l atrain at the same time that communication is '
' taking place between a'pas'senger on the train
and some person in a wayside station: Or it may
_ 15V be that` communication _is taking placebetween
v Áfthe engineman at the head‘o! a train and’fthe
ot circuits and, equipment lon >the wayside to co-g
ordinate with the train carried'set illustrative in
Figure 4.
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The system will new_.be described as one for 15
telephone communication .in which audio ire
quencies are used for the business of the railroad '
jsame time communication is under way between (for communication between conductors and en- ,
a passenger on the train and some person in a ginemenfand the train "d1spatcher); and radio .
I frequencies,- of a band somewhat higher than the
20 wayside station, or `on'arlother train. ~ . y
\ ` conductor .at the rear of the train, and._ at the
A principal :object of the present invention4 is- 'audio band, are used> for commercial purposes
_the provision'lof a system» embodying improve- " (for communications between passengersA on
' ments inthe communicating means, employed as l trains and persons in wayside stations, and bef
a part ot the tr'ain operating system, described ' tween passengers on diiIerent trains).
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In Figure >1, .the boundary/line BYIO ~encloses 25
"25 and claimed in the copending application of
_
the
radio frequencyL equipment and the boundaryv
f 'ArchibaldGJShaven Serial No. 227,932 filed Oc
line BYII encloses the audio frequency equip
l _ tober 22, 1927,'in which communication may take
place between theßngiuem'an at the head of the Y ment, all onthe train.- T3 is the radio frequency
'_ cram and the conductor at the _rear of »the mun,y transmittingmeans inla circuit including con
j 3'0 or between either o! these latter two, or both of
_ them, andthe train dispatcher while the train is
movlngàpr standing still ‘and the dispatcher is
in' his oilice. , The present case also represents a
further development> of my train telephone sys
` 35 tem application, inedl september '1,' 192s, serial No.
ductors 200 andj20ll, modulator _and oscillator
30
MilOl, conductors 20| _and 201, filter FL2, con-I
ductors202 and 203, inductor INDLconductorMll,d _
inductor INDl and conductors 205 and 200. R3 is
a radio frequency receiving means in a circuit in
cluding conductors 2|0' and‘2l3, detector DET3.
conductors 2li and 2M,- ñlter FLI, conductors
A further obiect oi' the invention relates to the v inductor
212,l 202- and203,
INDS _andinductorINDl,
conductors 205 conductor~'20l,
'and.2l5. The _. »
provision' of ‘means `for carrying. on a plurality
oi'_ communications overv the _same general sys-À
audioufrequency system comprises transmitting
0 terno!` connecting circuits without ,detrimental - and receivin’g setsy Z3 in a circuit including con-l
interference between the various? sets of com@ - ductor 2li, nlter FLA, conductors 2i0 and 20.3,
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municatlons.
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_ _ The improvements «in the _present invention
inductor> INDI, conductor 20I,_inductor.` INDl \
and conductors 205. and 2|0._"1’he inductors
_ _ center 4about the application of audio ando radio
IN'Dliand ISNDly are oi' suitable design and so _ '
45 frequency means to the novel means .provided for
positioned thateachrides over a Vtrack rail TR
45 _
- so connecting two parts of a train, two trains,'and ' in' inductive cooperation> with said track rail ~,
through an‘ air gap. >While these inductors- are _
l _ 4 a train anda wayside station >together for 'com
munication purposes, that twov or moreseparate lhere shown connected in series, they may b_e con
,to
` and> dlñerent communicationsmay be carried lnected in parallel; and- the system is operative if
only one inductor is used.
on at. the" same time over the same communi
eating medium.
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.In Figure 2, two complete intermediate circuits. . ~
B-_C and‘D-E, and parts voitwo others; A- and-M f»
are illustrated. TR are the track rails'of
preferred embodiment' of the invention:> ' l f
Figure `11 is a4 schematic diagram of the circuits 'a 'stretch of -track. - C_A represents therear end
`-5_5 - andv equipmenton one or bothy ends ofthe
»o and LQ the front end of a train.` Also,- those
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In the
drawings, .which'show a
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2,124,450
same symbols, minus -the connecting line, may
within the boundary une BYn are represented
be understood totrepresent two trains in the same the audio frequency circuits and equipment- in
intermediate circuit, CA being one train and L0 the wayside station or dispatcher’s oi'iice. Z4 is
the other'train. TAR is a control relay which is f the transmitting >and receiving set in a circuit
'5 deenergized during and by the presence of a including conductor 232, filter FLB, conductors 5_
train in intermediate circuit o? section A, but
otherwise energized. TB, TD and TF are track
k circuit relays of` the usual sort normally ener
»
gized, but deenergized, whenever there is a train
10 in their respective sections B, D and F. TA, TC
and TE are telephone transformers each with a
primary'P and a secondary S. L isa conductor
-extending throughout the length of the stretch of
track which is equipped for train communica
15 tion. DI and ‘D2 represent the two conductors
of a wayside telephone system, as for' example
the well» known dispatcher's telephone and selec
23|, 224, 225, DI and. 55, condenser EC, primary
coil P of transformer TE, Iand conductors 54, D2,
2i9 and 233.
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_ Switch J I manually operable, is included in
each of the circuits for T4, R4, and Z4.
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.For the several intermediate circuits shown a
different method of connecting thev transformers
to the telephone- conductors DI and D2 is indi
cated. Transformer TE is in permanent connec
tion.
Transformer TC is connected only when 15 „
the selective system device DSA' is operated to
energize relay SL to close contacts -46 and 41.
tive system now in use on nearly all railroads. ‘ Transformer TA is connected to conductors DI
SL is a selector relay operated by the selective and D2 whenever there is a train in section A
20 system, which is ordinarily a part of the dis-_ so that relayjTAR is deenergized. In actual 20
patcher’s telephone system for calling operators praetice'one, any two or all three of these meth
>in wayside stations to the phone'. ‘ 4_6 and 41 are ods of connectionmay be used within the corn-y '
'circuit making contacts’ normally open but closed \ pleted system.
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when SL is operated by the prescribed code in the ' DSA represents selective apparatus of the type l
25 selective system when DSA Vis operated.
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now used in railway telephone systems for dis- 2;,
For the intermediate circuit A the partial cir
patching trains. This apparatus .is operatedvto
cuit conductors L and 32, secondary coil'Sof‘ connect the conductors DI and D2 to the trans
ltransformer TA, conductor 33, contact 3| nor
mally closed,wconductor.3ll, condensers AK and
30 connections to track rails TR, are illustrated.
That part of intermediate circuit A not shown
is like that illustrated and described for inter
mediate circuit F-è-G.
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The intermediate circuit B-C comprises track
35 rails TR, connections. to condensers AK, lcon
formera, as TC, whenever it is desired by 'thevdis
patcher to hold conversation with a train vin a
particular intermediate section >which is equipped 30 a ~
for selective connection.
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JI' is a disconnecting switch shown merely as
a convenience for disconnecting the station
equipment from the outside lines.
',Flgure 3 illustrates the equipment which will 35
lusually be installed onthe head end_of the train4
ductor 30, contact 3 I, normally closed, conductors
33, L and 42, secondary coil S of transformer TC, and it isfor audio frequency operation. Gen- `
conductor 43,1contact 4I normally closed, con _ erally the equipment on the head end of the train
ductor 40, condensers AC and connections to the
40 track rails.
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is for the use of the engine crew in conversing `
with’ the conductor and dispatcher, -hence from 4o
The intermediate circuit D-E comprises track ' it only one conversation at a time is necessary.
rails TR, connections to condensers AC, con
ductor 40, contact 4I normally closed, conductors
` In any case where niorethan one setof .com- ß
munications is to be under way at one time from
43, L and 52, secondary coilJS of transformer TE, ` the head end'of the train, the equipment and
45 conductor 53, contact 5i normally closed, con
circuits illustrated in Figure 1 would be used. ZI 45’
» ductor 5l, condensers AE and connections to the
-‘track rails.
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is’the transmitting and receiving set >in a circuit
including, lconductor 231, fnlter FLE, conductor ~'
For the intermediate circuit F-G thepartiai 235, inductor IND5, conductor 235, inductor INDI
circuit track rails TR, connections to and con
and conductor 234.I The inductors IND5 _and
50 densers AE, conductor .53, contact 5| normally lIND4 arealso positioned to ride over the track 50 f
l closed and conductors 53 and L,_are illustrated. rails 'I'.R., in inductive cooperation with said" rails ¿r
That part of intermediate circuit F-G not shown through an air_ gap.- .These _inductors‘are of
-is like that illustrated and described for inter
suitable design. 'They may also be operated in*
parallel connection, and only one may be desir
55 The heavy lines across the track rails TR as able in certain installations.
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_indicated by 24n are insulated. joints fixing .the u Figures 4 and 5 are illustrative of another type
- limits- of the track section circuitsA, B, D, F, etc. of system for making possible 'the vsimultaneous l _ 'medi'atecircuitA.
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In order tó make the track rails part of the in-n transmitting and receiving of a plurality of oom- '
termediatel circuits c'ompletefor »conducting the
' o0 communication currents, a condenser -TK is con- '
nected around each insulated joint as illustrated.
Within the boundary line BYI2 are represented '
munications to and from a train. In this system
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audio frequency is used _for one channel of com-- 0_0
munication and radio frequency’ for another -
channel. It differs essentially from the system
- the radio frequency‘circuits and_equipment in -- heretofore explained, as illustrated in Figures 1,
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the wayside- station. T4 is the- radio frequency Ii’. and 3, in that each channel of communications
has acircuit of its own and each _track rail is de- o5
duetorsflgs and 229, modulator ‘a'nd oscillator _ voted to, a different intermediate :circuitso that
l `limohconductors 221 and .230, filter FIA, con- ' _for each section of trackthere are _two parallel
` duct'ors 225, DI and”, condenser EC,.primaryr ¿intermediate circuits, one: of these 'intermediate
'con P of transformer TE, and conductors u, Dz, lcircuitsrbeing used for the audio vfrequency com'
2|_3 and1 225. R4 is a radio frequency receiving munication and the other for _the radio frequency 70
means in a circuit including conductors' 22! and communication, -These intermediate circuits oon
22,2, detector'DE'N, conductors 223 and 223, iilter
FL5, Fconductors 224, 2 I, DI ~and 55, Acondenser
y EC, primary coil P of
' _75 ductors 54,-D_2 and 2I9.
ansformer'TE and con- "
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nect to differentïsets of wayside lines.
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«. In Figure 4". the boundary line B21 encloles, '
‘the entire equipmenton the train for'one let.
If there is a s__econd set,y it may be a duplication .75
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ci the acne shown. ordinarily. however. vtnec‘eet connected es illustrated in Fig. 5.' e'rcund au in
at the. head‘ o! the train will comprise the audio
frequency equipment only which isl that' includ- `
ing the transmitting and receiving equipment Z1,
5 the iilter FLC, the inductor IND8 and the con
Y necting ycircuit composed of the conductors 200
and 80|.
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sulated joints.
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For the-radio frequency operation the interme-¿ f
_diate circuits are: »
Section AI, partial circuitonly shown, con
ductors‘LG and |80, transformer TAI -, conductor _
188,' 'contact I8I normally closed, conductor |82,
1
'I'he ¿radio frequency set comprises the trans
mitting apparatus T8 and the receiving apparatus
- and 'condenser -to track rail TR2.
That part of
thisintermediate circuit AIy not shown is like that
illustrated'and described for intermediate circuit- 10
„ 0 R5 connected to the Inductor IND1. -_ The trans
f mitting apparatusl T8 is in a circuit including Fig-GI,,includingyconductors L8 and I 8| , con_`-'
i modulator and oscillator M&O5, filter FL8, con ' tactv|89, conductor |90, condenser and track rail
TR2
ductors 802 and 800, Inductor IND1 and _con
section BIL-ci, complete circuit, track ?aii "
ductors 301 and 808. . The receiving'apparatusR!
is ina circuit including detector DETI, i'llter TR2, condenser, conductor |82, contact |8I nor 15
FL1, conductors 804 and' 80|, inductor IND1 and kmally closed, conductors |83, L6 and |84, trans'
conductors 801 and 008. ’I'he inductors IND1 and _ former TCI, conductor |81, contact |85 normally
` IND8 are of suitable design for. the frequencies closed, conductor |86 and condenser to track rail
used and positioned to ride over the track‘rails »
2o TR2 and TRI respectively in inductive coopera-'
' tion with `said rails through an air gap.'
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'Section DI-`E|, complete circuit, track rail
20
TR2, condenser, conductor |86, contact |85 nor
- Where both ends of the train are equipped with \ mally' closed, conductors |81, L6, and |88, trans
communicating sets', the inductors will be posi
‘ ‘ tioned in accordance with their respective inter
mediate circuits.
If onel end ofthe train is'
, equipped for audio frequency operation only, the
_ inductor for that set'will be positioned over'rail
former TEI, conductor~ I9I, contact |88 normally _
closed, conductor |90 andcondenser to track rail
TR2.
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' Section F|-GI, partial~ circuit only shown,
track rail TR2, condenser, conductor |90, contact
|89 normally closed, conductors ‘I 9 I , L6, etc. That
" TRI. In the case of trains operating- in both di
part òf the intermediate circuit FI-¿GI not shown
rections on one track, it will be necessary that in
is like that partial circuit illustrated -and de
30 ductorsv be provided for each direction of opera
tion; or the inductors may be interchanged in' scribed for intermediate circuit __AI, including
track rail TR2. ` _
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some manner suitable for thel frequencies'in
Included in the track rail TR2 are ¿insulated _
volved.
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Figure 5 shows h_ow the equipped stretch of 'joints limiting the various track circuit sections
" track is divided intoy territories or sections as` AI, BI, D|,FI, etc. _ In'order that the communi- '
' AI, B|---'CI,DI--E,IA and F|--G|, each comprising ` cating ,current will have an uninterrupted path '
two intermediate circuits, one for each rail. As . through the track rail TR2, condensers are 'con
illustrated. AI and Fla-GI have partial interme-l
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diate circuits and B|-_-CI§ and DI---EI complete
`4|) intermediate, circuits.
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For the audiofrequency operation the interme
diate circuits are:
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‘ sductors
y
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Within the boundary line BY8 are represented
the radio frequency apparatus and circuits in a
wayside station. T1 is the radio frequency trans
-AI, partial circuit only shown, con ' `mittin'g means in a circuit including, a modulator
and |80, transformer RAI', conductor
‘ "455 |08. contact- IBI Anormally closed, conductor |52
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and
condenser to track rail TRI.
That- part_ of «
this intermediate circuit AI not shown is like that
illustrated and described for intermediate circuit
_
nected 'around the insulated joints' as' illustrated
_ in Fig.l 5.
FI--GI , including. conductors L5 and III, contact'
:.:i III, conductor Ill, condenser and track rail TRI.
’ f‘ Section BI-CI, complete circuit, track rail
and oscillator M8101, filter FL8, and conductors
M8 and 8 I2 and 309 and 8|8 connecting to tele
phone conductors D1 and D8 which extend along
the equipped railway track.- ' 4R1 is a radio fre
quency receiving means in a circuit including,
detector DET1, iilter FL8 and conductors 3I0 and
3|2 and`3II. and 3I3 connecting to conductors
D1 and D8. f
.
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Within the boundarylineÍBYS Aare represented
the _audio frequency apparatus and'circuits
ina
many cl
’ conductors 'sa' L' and s
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»_ wayside station or dispatcher’s oilice., lZI; is the
former RCI. conductor I l1,_contact _|55 normally transmitting and'receiving set in a circuit'in
55.r
closed, conductor |58 and condenser to track rail
‘ cluding filter FLD and conductors 3| 5 and 3M`
connecting respectively tov4 telephone conductors
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Section DI-EI, 'complete I circuit,v track mii„_TRI, condenser-„and conductor |88.' 'contact III D5 and D6 which extend along the equipped
TRI. condenser, conductor |52. contact |5| nor
used
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I 4,'trans-y
` _ 4normally closed;` conductors |81, Li and |88,
mi ` transformer REI, conductor- Ill, contact |80 nor
, mally closed, conductor |88,»condenser and track
-railTRL-`
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¿section ifi-cil, partial circuit 'only shown,
»- ~.-track rail TRI. condenser, conductor |80, contact
i* |88 normally closed. conductors _I_II '.Ll, etc. That
railway
track.
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>CAI represents the rear end of a train and 60
.LGI the front end. The same symbols minus
the connecting line may be understood to rep-`
'resent twotrains in the same _intermediate cir
cuit. CA'I being one train and LOI the other.l
DSE represents the selective'equipment 'on the
65
part of this intermediate circuit` FI-'GI not . ,wayside or in the dîspatcher’s `oillce used for_
shown is like‘that partial circuit illustrated and operating the selector relays SLC and SLE. - `
‘described for intermediate circuit AI including
_` 70 ` 'Included in, the- track rail'TRI are‘insulated
`t
Joints, similar to those referred .to by _symbol 24 _
` _~ ~`in"Fig. 2, limiting the various'track circuit sec-,
"'tions‘A-ITBI, DIJ'I , etc. In order» that the com
»municating' current will have anvuninterrupted
' 'u cath through the track rail Tai, condensers `tire
TARI, TCRI and TERI are control~ relays nor-e.
mally energized, but decnergized _with the pres
ence oi' a._ train in their respectivesectiòns All,
BI-»CI and DI--EI.,_ TBI, TDI-and 'I'EI are
track'circuit relaysof the' usual sort normally
energized, but deenergized with a train- in their i
respective sections BI; DI `and FI.
TAI, TC-I and '_I'EI are telephone _transformers
,
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Z3,- the dispatcher receiving the signals in his
designed for radio frequencies, _the secondaries
equipment Z4. Communication between the dis- ‘
of each being in the normally closed radio inter'
mediate circuits for sections AI, BI-CI and patcher and train conductor is -now _carried on.
The channel for communication between the dis
DI--EI respectively, and the primaries being con
nected to wayside telephoneconductors D1 and patcher and’train conductor comprises transmit- 5
ting and receiving set Z4, conductors 233 andv
D8 whenever relays TARI, TCRI and TERI re
spectively are deenergized operating their back 2I9,- conductors 232, 23|, v224 and 225, conductors__ contacts to the closed position. When back con > DI and D2 to transformer TA, intermediate eir
tacts |62 and |63 are closed, leads |1| and |12 cuit of A already described, the inductors 4INDI
andv IND4 and conductors 294, 209,v 2|3, 293, 2|! 10
10 of primary coil P of transformer TAI are con
nected to conductors |15 and |16 respectively.
and 2|1, and- transmitting and >receiving set Z3.
When back contacts |66 and |61 are closed, leads
|92 and |93 of primary coil P of transformer
TCI are connected to 'conductors |94 and |95
Since this conmiunication is carried on yat audio
frequency filters FLB and FLA are adjusted to
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let electric currents of audio frequency through, _
but none other. Since ñlters FLZ, FL3, vFL4 and 15
respectively. ,When back contacts |69 and |99
FL5 are adjusted for the particular` radio fre- . ‘
are. closed leads |98 and |99 of primary coil P
quency band usedin this set up,~they do not
pass electric currents at audio frequency; hence
receiving equipments R3 and R4 are not disturbed
and |91 are connected to conductor vD1.y Con
20 ductors |13, |94 and |96 are connected .to con- » by the communications transmitted at audio 20
' of transformer TEI are connected to conductors
|99 and |91 respectively. .Conductors |16, |95
ductor D8.'
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frequency.
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A
In, the meantime the passenger with _trans- ‘
'I‘he transformers RAI, RCI and REI are .de
5 signed foi' audio frequency, the secondaries of
each being in the- normally‘closed audio inter
mitter T3 and receiver R3 has entered into com
munication with a personv using transmitter T4
and receiver
The :channel for these com- 25
25 mediate circuits for sections AI, BI-CI and
DI-EI respectively. .Leads |13 and |14 _from ' munications is also via the inductors IND3 and
IND4, the intermediate circuit of A including the
transformer TA, 'and the conductors DI and D2,
and _vice-versa. Since this communication is
transformer RAI are connected to telephone con- ~
ductors' D9 and D5 by the closing ofv contacts
|84 and |65 on conductorslill and |19 respec
tively. Transformer RCI is bridgedacross tele
phone conductors D5 and D6 when selector relay
SLC is operated by the train dispatcher ’to close
carried on at radio frequency and the filters 30
FLB and FLA are adjusted for audio frequency
contacts 3BG and 3|1. . rTransformer REI is simi- _
band used are not passed into the >circuit of Z3
larlyy bridged across the conductors 'D5 and DB'
and Z4; hence the communication being carried '
only, electric _currents of fthe radio frequency
operation of selector relay SLE.
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on between the dispatcher and train conductor 36
35 by the closing- of contacts _3| 9 and 3I9 in the
' i is--not disturbed by the communication taking
'
In the -system illustrated in.FiguresV 4 and 5, ¿place between the passenger and the wayside
. 'thef use of‘one radio-frequency band andl one
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person.-
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. vIn the operation of the'system, electric cur
,rents induced into the intermediate circuits 40
«i0` mitting and receiving simultaneous sets of com
, munications. Since there-are twoseparate and . through the transformers, as TA, set up a field of
distinct communicating lcircuits or~ channels electro-magnetic impulses surrounding the track
audio frequency has been referred to for ltrans
throughout the system, it is readily apparent
rails TR.. This electro-magnetic field influences
' that audio frequencies alone or radio frequencies
45 in the same band,'or radio frequencies -in diifer
the inductors on the train to set up currents
ent bands _may be used, instead voi’ the one4 radio
of similar 'impulses in the circuits of the induc- 45
tors, thus affecting the receiving apparatus on
frequency band and one audio frequency band,
the
for simultaneously carrying on a plurality „of
Y sets of communications.
train.
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„n
A
.In the case of transmitting- from the train,l
the electric currents in' the inductor circuits are
` transmitted inductively into the track rails and 50 .
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Operation
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Reference is: to the system disclosed in Figures
thus into the> intermediate circuits and through
the transformers, as,TA, to the circuitincluding
the conductors DI and D2 and the wayside re
_Assume that the train isin section A and
that 'the dispatcher, with the equipmentrepre-Y
_sented within. the boundary line BYII, desires
ceivingequipment, aifecting the latter -to give the
equipment ~represented within the boundary _line
to the wayside circuit,'includi_ng conductors DI__
and_D2 leading tothe wayside stations. communi
1,2and3_:`.
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required
While signals.
the train. Isin
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section'
_
A, , the interme
to give order's tothe -train conductor using the ' diate circuit of A being automatically connected
B_YfIIr Also assume that at the same .time a
Aer on the train, using the equipment rep
resented within the boundary BYI Il, starts a con
~-versation with a person in a wayside station,- 1
„ usingl the equipment within ‘the boundary line
BY`I2.
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The 'trainfbeingin' section A, relay TAR is
deenergized closing contacts 34 and 39 connect
_ ing/transformer' TA vwith conductors D2 and DI. `
The dispatcher makesit known-to the train
conductor' through the equipment za, by caus
ing. electric communication impulses to be set,
~ up in the channel `-for `communication hereinafter
cations may be- freely carried on and at will be- 60
tween the _train and thevwayside, either station
initiating.the communication.
L
-
i
' _.
_Assume the train to be in section lB--C and that
simultaneous communication is entered into be- ‘
tween the train conductor at the rear of. the 05
train CA and the engineman at the head of the ‘
train LO, and between a wayside person and a
' passenger on the
._
' The conductor initiates the vcommunication by” .
operating the transmitting ’equipment of Z3'. '_10
This sets- up audio frequency' current _in the‘cir
described, that he _desires to communicate with __'cuit affecting the inductors mm and motto
induce'audio frequency impulses into ,the track
through the receiving equipment of Z3. and an ,rails-'I'Rjsuch that the intermediate circuit. of
' him. ‘The train conductor receives the signal
sw'ers through the transmitting. equipment of B-'C heretofore described energized with audio 1l
i
l
2,124,450
_ \
5.
‘ frequency currenti Äs the -induetorsy IND5' and that simultaneous communications are carried on
INDS at the head of thetrain LO are in inductive
l - relation with the track railsA TR, audio frequency
current in these track rails isL induced into the
using »transmitting and receiving apparatus Z1,
circuit of 'said inductors and the communication
and between a wayside person, using transmit»4 5 f
` is received by the engineman at Z5'.
` _ .
When the I ting apparatus T1 (and receiving apparatus R1,
and a passenger lon a train using transmitting
engineman replies to the train conductor, the
audio frequency current initiated by lhill through
apparatus T5 and receiving apparatus R5.
the transmitting equipment of Z5 in the circuit '
-'I'he dispatcher must initiate the communica-_
tion with the train conductor by first operating
10 for the _inductors IND5 and INDE is induced into
' the intermediate ‘circuit B-C and reinduced from
his selective 'equipment DSE to closeY contacts -
3I6'and 3I1 o'f selector relay SLC, which _con-
said’eircuit "into the circuit of‘inductors >IND3
nects the wayside circuits, conductors D5 and D6.
-' and IND4 thus affecting the -receiving apparatus
e
to the transformer RCI in the intermediate
` Z3 so that the conductor hears the engineman’s
15
between ‘the train dispatcher, at the station en
closed in boundary BY9, and the train conductor, ,_
signals.
.
,
.
`
_
’
For the wayside person to'communicate with»
‘ Ithe passenger, selector relay SL must -iirst be
operated to close the contacts 46 and 41 which is
don'e by operating the selector from the proper
20 code key in_the selector ,system generally desig
‘
circuit including- track rail TRI of V>„section
BI-CI. Through ,the ltransmitting equipment
of Z6 the dispatcher may now send signalsto
the train conductorf the channel-of communi
cation being conductors D5 and D5, transformer
RCI, intermediate circuit BI-CI including
i nated as-DSA. _The closing-of the conta'cts 46 - transformer RCI and track rail‘TRI’ already ‘de
-
and 41 may also be done direct by the wayside
person in the usel of the dial system of. an auto
matic telephone -system identically as. is now
scribed, Inductor INDII andthe circuit to re
ceiving equipment Z1. -The train conductor by.
operating the transmitting equipment of Z1 may
reply to the dispatcher through the'same channel
accomplished, in machine switching lfor connect
ingr „one subscriberv with another-in many of the _of communication, sequence reversed, for re- -
,j present day telephone exchanges.
`ception bythe dispatcher in the receiving appa-r Y '
With contacts 46 and 41 closed transformer TC vratus of Z6.'
so
.
_
is connected to wayside communicating circuitV
conductors DI and D2.' .The .wayside person‘may
now communicate -with the passenger through
transmitting equipment T4, `conductors DI? and
` D2, transformer TC, intermediate circuit B-C,
while the' ‘train 'is within che section Bl-'CL
control relay TCRIsis deen‘ergized closing its con- '30
tacts |65 -and |61 connecting the wayside tele-‘i _
phone circuit D1 and D8 to transformer TCI s'o ,
that the wayside system includingA the stationv _
_within the boundary line BYB, is connected to
ratus .R,3. »The _passengermay respond into- _the intermediate circuit-of section BI-CI including transformer TCI and track rail TR2.
transmitter T3, 'through thefsame .channel de
Through the transmitting equipment T1 the way
scribed, to the receiver R4. '
'
since alters Fm, r1.3, Fu and FLs are ad-> side person may `send signaisto the’ passenger,
' justed to th'e radio. frequency> band and will the channel of communication being conductors
40 not pass the audio frequency and since the> « D1 and D8, transformer TCI, intermediate cir- 40»
filters FLA and FLB are adjusted to the audio cuit of BI-f-CI including track rail TR2, inductor
' inductors IND3 and IND4 and receiving appa
` _ `frequency, and will' not passfthe Vradio frequency
band; the simultaneous communication between
_IND1_ and.` circuit to receiving equipment R5.
-The passenger by communicating through trans- .
train conductor and engineman an`d vbetween ' "mltting
«3.451 wayside .person
and passenger may becarried
on without interference, one' Withthe. other.
~ »Assume that CA and I_IOl are two- differentl
equipment T5A may reply through` the
same channel, in reversed sequence, to the way
side person at the 4receiving equipment R1. »
As heretofore explained, the operation for com
- munication between _train equipments T5-R5
taneous conversation takes place between train _ and wayside equipments T‘I-R1 is byfa band of
conductor of LO and train conductorfof CA and radio frequency» while the operation for commu
trains,~ but both in ,section B-C; andsimul
»between a passenger on yL0 and a passenger
on CA.
The procedure and' method for com
, municating between'the twc train conductors is
__ the :same as alreadyexplained for communica
`tion between the train conductor and engineman
ofthe -same train. 'I‘he procedure. and method
for communicatingbetween the passengers’ of
the two trains issimilar to that Lalready ex
plained-for the communication between the train
nication between trainiequipment Z1 .and way
side equipment ZG is by ‘audio frequency. The
ñlters-FLB, FL1, FL8 ._ and FL9 are adjusted to
pass- the radio frequency band while the filters
FDC and FLD are arranged to pass audio fre- 55`
quency.
This provision for ptwo different fre`--l ‘
quencies is made lmainly for the purpose of prie-V
ventiríg'interference, as cross talk, which mightv
result in some cases, particularly as between the
conductor and engineman of the same train, ex- " track railsTRI and TR2.
__
_
cept radio frequencies are `used _for the pas-_
There may be- simultaneous communications
senger to passenger communication. Because
« consisting of a conversationïbetweenthe rear end
60
the >filters of the audio frequency system `will ~ CAI and thefront end LOI _of the train and a
` _ not pass the radio' currents and the ñlters of the 4conversation‘between a.4 passenger on thel train- . y
65 radio frequency systemwill not passthe audio _ and a .person on'the wayside. -_ The front end of 65 `
‘
‘ v currents,l the‘two setsv of' communications lmay ' train must have an equipment identicalwith in-
‘be carried on simultaneously. A set’ of ,com
ductor INDB audits circuits including transmit- '
_
munications,
herein referred to, consists of rting and receiving equipment Z1. The train conthe~ messages“ 'exchanged betvíè'e’n tw`o"`"'persons ' ductor‘f’italking vinto transmitter aequipment Z1,
communicating together;
has his lmessage conveyed by audio frequency via 70 ~
.
¿ Refer now to the system disclosedgin Figures Inductor INDB, track trail TRI and intermediate
circuit, inductor INDB and circuits onfront of>
4and'5:
_
.
,_
A
f " Assume the ltrain to be operating through _the
the train -to receiving apparatus Z1 on front ofv
` sectionn'BI--CI as illustrated, being equipped on
the train where the message is received by the
the ?ear end CAI, as indicated in Figure 4, and ~ engineman. The engineman replies to the train` 75 ._
| .
6
one enlarged intermediate circuitor commu
conductor through the same channel of commu
nication, sequence reversed. While the conver- ,
nicating
zone.
'
»
'
'
This condition may be specifically illustrated
sation> between the train conductor and engine
er 'talks into trans- » byreferring. to Figure '2 and ~assuming a train
man is going'on the
mitting equipment '11 to the wayside person and
his communication is carried via inductor IND'I,
`possing‘from intermediate circuit B-C to> in
track "rail TR2 and( intermediate circuit Bil-CI,
track section D relay TD is deenergized closing
its _back contact 4I. Conductor' ìL for interme
diatel _circuit o! section B-C’is now connected to
termediate circuit D-E. As the train» enters
transformer TCI,v wayside circuit conductors D1
and D8 and receiving equipment R1. ' The way
10 side person replies to thepassenger by talking
conductor L for intermediate section DE via con
ductor 42, back contact II closed and conductor
into transmitter T1~ and -his communication is
carried by the channel just described, in the re-4
verse sequence, to receiving apparatus R5.
4I. yBy reason of back contact/4I being closed
transformer TC is shunted from the circuit; but Y
as front contact 4I opens, creating the enlarged'
- Conversations between parties .on two dlifer
15 ent trains in. the same intermediate circuit are _ intermediate circuit, the transformer TE is made
conducted in the same manner as between heady available as a part of the enlarged intermediate '
end and rear end of train. Two sets of conver
‘sations may be carried on at the same time,
'circuit forl communication between wayside and ~'
train. -While the train isiwithin this enlarged
intermediate circuit, that is while any part of
the train is within the track section D, com
munication carried on ‘between vthe front and
track rail TRI and its intermediate circuit be
ing usedvas a channel for one set, and\track
rail TR2 and its intermediate circuit being used
rear o! the train, between the train and a way
side station, or between the train and a second
train, should there be a second train in section
B-C or D-.-E, will be via the enlarged inter
mediate circuitv which in'cludes the track rails
as the channel for -the other set. Aset of con
versations as here'termed consistsoi the mes
sages exchanged between two persons talking Vto
gether.
v
t As illustrated in Figures 4 and 5 the train cir
TR.,~ the‘ condensers AK, front contact 3|, con
cuits and the wayside circuits for lone channel
>of communication, that carrying radio frequency,
ductor L, back contact II closed, conductor L,
transformer TE, front contact Il closed and con
densers AE. Thus it is seengthat the train is
are always in operative relation as theV train pro
30 greases over the railroad, the train automati
cally connectingthe intermediate .circuits with
always in a communicating zone which is suc
cds indicated, may be used, dependent upon the f
ingthetrackrailTRI). WhenrelayTDI‘isde
cessively an intermediateì rcuit as for" section
the wayside circuits as'it passes through the sec
tion for each circuit. For the- other channel `B---43, an enlarged intermediate circuit as for
of communication, that carrying audio frequency, sections B-C plus D-E, Ithe intermediate cir
35 :the trein‘eireuits end the wayside eil-cuite ere ycuit for section D-E, etc., a travelling interme 35
lalways in operative relation while the train is diate circuit or communicating zone being In
v
in section AI, because of the train on the track reality created by this arrangement.
In Figure 5 a trainin
irom-oneinter
rails automatically connecting the waysidecir»cuit with the intermediate circuit through relay mediate section, as BI-CI, to- another interme
TARI; but for sections BI-CI and DI-EI the ‘ diate section, as DI-f-EI, deenergises the track 40
circuit relay, as DTI; thus causing each ot the
selective system must be operated in order to es
` ' tablish operative relationship between the way-y two intermediate circuits, as for section BI-CI
(one including the track rail TRI and the> other
‘ side and train circuits for the audio> frequency. '
the track rail TR2) to be combined
These various -methods -of coordinating wayside including
with the respective intermediate circuits oi -the
and train carried circuits are typical. Any one adjacent section, as for section DI--EI (one in 45
method or 'any two or more of -the several meth
cluding the track rail TRI and the'other includ
local conditions existingßn the railroad equipped.
energized, back contact II! is closed shunting
For the conduct of> the railroad business, it is
generally best to provide an arrangement which
transformer RCI and connecting conductor-Ll
oi' section `BI--CI with conductor Ll’of section I
„Will allow the greatest Dœyßlble freedom for intra
DI-EI.; also back contact III is» closed shunt
ingtransformer'rclandconnectingconductor'
train - (head end to rear end) >and inter-train ‘
» (train to train) communication .and at the same
LO .ot section BI-'CI with conductor-“ of sec
tion DI-EI. ‘ Thus,.for the period the train is
in track circuit section-DI. theinterm'ediate cir
55 time give the train crew an occasional oppor
tunity to initiate a conversation withìthe dis
patcher.` _With the selectivel system ythe dis
cuits including .the track rails TRIand TR2 are
l patcher can always get into communication with
a train. After thelselective system' has been op
» erated connecting the‘wayside system-with 'the
enlarged 'covering both the Asections Blf-,CI and
DI-EI and including‘transformers REI and TBI
respectively. As the train travels over the -rail
road it creates for itselia prescribed communi
intermediate; circuit and communication has
ceased. the wayside systemv is disconnectedi'rom ` cation sone travelling with the train which corn-I
the intermediate circuit by vagain operatingfy the
the .two intermediat‘eïcircuits, one eaclïi'or
selec‘tivesystem.
‘-
v
,
‘_’
_.
’
TRI and
s
The condition existing- where >a. train `posses „ In the we systeme: eemmumeetien‘nerem
' from one 'intermediate -e'ireuit te another is- muy` described, as illustrated injl'lgures i. sand 3 and
_ described in my copending applications Serial No.,
,932 »med October 22„ 1927 -am! SerlaLNo.
304.433 'med september "1. 192s.
70
i
1
.liefen-ingcorrigeren2mais.atriiininpeà'sine`
imm' enefintermediate eireuit te another «uw
_.4 end 5,31 neveshewnfsñeeineeny newwev »eu
of eonve'rsatims, or‘cemmunicationamay becar
nedenez me nmetime. simula omebeineedw» "
for
communications. or
ad 70
ditional sets _otfcommimicationato be carried
matically opens the cross connection fir'om the. '.on simultaneously With‘ï'tpode'deactlhedg'it Il 0b
“parallebconductonl'i to
so‘that vious'the'ssme‘maybe-’donsby providingvothsr,
Vd‘lrilltthe interval oflpassIng-these two adjacent orseveralrradio
bands, each
1s, intermediate' circuits
thrown `togetllierinto
M
l,
_
'
enligne
‘f the‘vehicle for transporting theadditional sets
i of communications over the same'circuit me
'
dium.
to, a radio frequency wayside station connected. f
to a pair of said conductors, an audio frequency
`
What I claim as new is:
s. m ccnilmnaicn,> c railway track formes in
sections, a plurality of conductors` parallel there
-
1‘.~In a system adapted to simultaneously
‘i transmit a -plurality of sets `of communications
wayside' station connected to another `pair of'
scid conductors, track, relay controlled circuits
between av railway train and the roadside, the
for electrically connecting Ísaid radio frequency _ `
«receiving devices on the roadside„said 4transmit
necting said audio frequency pair ofconduct'ors
combination comprising, , transmitting> and re ' pair ofk conductors in operative relation with one
rail of saidytrack 'and means electricallyr con- f
i i, ceiving devices ïon'the train, transmitting and
l0
ting devices generating bands of electric current
-` `frequencies 'for conveying said Isets of communi-> `
to the other rail of' said track.
'
_
'7. In combination, a railway track, aplurality
` cations one band for each set, and circuit means of pairs of conductors parallel thereto, aradio fre- n
including the track rails adapted- to' inductively quency waysidestation connected to a' pairofsaid»
connect said train carried transmitting devices conductors and'an audio frequency wayside sta
with said roadside receiving devices and said tion connected to another pair of said conductors,
l `roadside transmitting devices vwith said train- - a pairv _of transformers one having its secondary.
carried receiving devices, ‘for _transporting said
electric current frequency bands.
y
`
Y
terminals connected to one of lsaid 'rails and the
other having its secondary terminals connected
2. In -ak system adapted to simultaneously ' to the other- of said rails, switches for connecting" transmit two sets -of communications between a the' primary of one of said transformers to one l “ railway train and the wayside, thecombinatlon of said pairs of „conductorsf'and additional‘
"comprising, audiofrequency transmitting and re
_ceivlng meanson each said trainv and said way- i
switches for connecting the primary of the other
transformer tothe other of said -pair` of con
side Afor transmitting and receiving one set-of
said,A communications, a' radio frequency trans~' . 8.' In combination, a railway track, a plurality
‘ mitting and receiving a.meiifns‘on eachl said -train of pairs voi’ conductors parallel thereto, a pairvof
- and said wayside for transmitting and receiving ‘transformers one having its secondary-terminals
ductors.
the other set of saidcommilnications, and circuit
-
'
»
i
f"
`
-connected to one of said rails and the other hav
ying its secondary terminals connected to the
l trically related. to the train carried means and `other of said rails, switches for connecting the
, means, including the track rails in multiple, elec
i, adapted to be connected to said transmitting and
receiving means on the wayside `for carrying said
primary of.` one of’ said transformers to oneI of ,
'said pairs of conductors, additional switches for
audio and radio current frequencies .between said connecting the primary of the other transformer`
to the other of said pair of conductors, an audio
`train and said wayside.
`
'
3. In a system adapted` to sinilultaneouslyy frequency wayside sending and receiving set con
` transmit a plurality of sets of `communications
` between a railway `train vand the wayside, the
nected to one of said' pairs of conductors, a radio - _ i
frequency wayside' sending and receiving set con
combination comprising, means on each said ` nected to the other of said pairs of conductors,
and a railway trainE on said track having an audio
train and said wayside for transmitting and re
ceiving a* plurality of frequency> bands,'one,band frequencyreceivingqand sending set connected
inductively to' oney ràïilßof the track- and a radio
` for each of said sets of communication, and cir
- cuit means in electrical relation with said train
means adaptable to'be selectively connectedwith
`said wayside transmitting and receiving means.`
_ 4. In a ‘system‘ adapted> to simultaneously
"‘ l transmit a plurality of sets of communications be
> tween two railway trains on the same track sys
tem, the >combination comprising, means on each
vtrain for transmitting and receiving a plurality
-'
frequency receiving andsending »set connected
to the other rail of said track.
9.l In a train communicating system, the com
bination comprising, 'a first anda second com
municating station for a train, a first and a sec
ond communicating station on the roadside, and ' ` ,
means creating a transmission medium traveling f
with said train adapted to so connecttogether
~ of frequency bands; each'band carrying one of ysaid‘stations that communication may be car- each sets of communications, and circuit means Y ried on between said first stations exclusivelyy at
forming a communication zone travelling with the same time that communication isbeing ,car
the trains, electrically related to` said. train 'Aried on between said second stations exclusively.
5 55 means, for fconnecting'the transmitting and re , . l0. In a train communication system, thecom
ceiving means of one'train with thetransmitting ` bination comprising, a first train station, a vsec
and receiving means of the other train.
ond train station, a first roadside station, a sec--MA
‘5. In a system for, carrying on two sets- of ond roadside station; and means, controlled in
` communications between` a` railway train and a “part by the train and in part from a roadside
wayside station, a track. system connecting com- . station, adapted to continuously connect together
said first stations and said second stationsl as
f »munication devices on `"said train with communi
cation devices on said wayside comprising, an
y"intermediate circuit including oneof` the rails
~ 05 of the track, another intermediate' circuit in
cluding the iother rail of the track, _both of said
L track rails being in inductive relation with 'the
« train devices”, and means operated by the pres
the -train travels` over the railroad, so that un»
interrupted communication between said first „ i
stations and uninterrupted communicationk be
tween said second stations may be`- carried on4
' simultaneously.
‘ 11. In a train communication system, the com- I
l'_bi'nation comprising, a first train communicating
.7`0’ tcrmcdictc circuit with 'come cf uic wcysidc‘dc station, a rsecond train communicating station, a mi...
vices for transmitting to and ?recelving'fl'om the first'V roadside communicating station, a second
train one setof communications, Iand selective roadside communicating station'. wayside means, ‘
means for connecting the other intermediate cir including a series of wayside 'circuits in communi
ence `of the' train on the track connecting. one in
cuit withother» of the _wayside devices for trans
mitting to and lreceiving from the train the ‘other
‘ set ofl communications.
u
.
catlve relationw-ith said train stations, a way
side'communication circuit connecting to each
of said wayside stations, circuit controlling- means
75
„
s
_ "12,194,450
associated with said series-of circuits adapted to . means contmued by said trains for placing sindy
connect each of said series with vsaid wayside " vehicles in communicative relation with _each
communication circuit. -and means associated
other.
with said communicating stations permittingex
»m
1°
«
_
l
17. In a system for communication between
two train stations and between one of said train
stations and a wayside station. a channel forcömmunications between said .train stations. a
clusive communication between said tlrst stations
simultaneous with exclusive communication be
ing carried on between said second stations. l
12. In a train communicating system, the com
different channel, for ^ communications _between
bination comprising, a first and a second com- _
one .of said train stations and the wayside sta
tion, and means associated with said channels
10 municating station on a train, a first and a sec
ond communicating station o'? the roadside,
maintaining the individuality of said communi
cations in said stations.
means traveling Vwith the train adapted to con
neet together said stations. means insaid sta
tions" for transmitting and >receiving non-con
ñieting" sets of communications simultaneously
between> said ñrst stations and between said sec
ond stations, and _means associated with said
stations maintaining the distinct existence of
Ieach of the said sets of communication.
_ _18. 'I'he combination, lin"a railway communi
cation system, comprising a stretch of track for
a traimof a loopr circuit including the running'
rails in said stretch, radio frequency current gen
erating means located at separated points onl a
train and arranged for inductive co-opcration"
with said loop circuit, and devices at'each train
point adapted 4to modulate and demodulate said>
radio frequency current whereby vradio frequency
signaling is effective between said train points
_ 13. In a system for carrying on a set of com
munications between a car _and the locomotive of
a train and simultaneously a set of communicaftions between said car and a wayside station. in
combination, a plurality of communicating sets
in the car. a commenting set in the locomotive
through saidloop circuit.
ceivingon a train a plurality of carrier currents 25
of different frequencies, a stretch of track in--
harmonizing with one of the ear sets, a com
cluding the two running rails for a train to run
over, a conductive intermediate circuit, includ
municating set in the wayside station harmoniz
ing with anotherof said car sets, a circuit meañs
on _the wayside in normal 'inductive relationship
with said car sets and the locomotive sets so that
ing electrical conductors, associated with' the
stretch of track and electrically closed with the
stretch of track either occupied by a train or un
communication may be carried on thereover be
occupied, operative with a train' running in either
direction and adapted-toV change with a train
moving over said running rails by additions to
the circuit ahead of the trainand subtractions
from the circuit behind the train, said -change
being dependent upon the movement of the train,
a winding located on said train‘in such manner
the
that,winding
with a is
train
disposed
present
near
ontosaid
and`running
separated by'd
tween the‘car and locomotive. means adapted to
Vconnect the wayside station set with'said circuit
means that communication may be carried on
over said circuit means between the car and the
.wayside station at the same time that communi
cation is under way between the car _and the
locomotive, and means associated with said car
sets whereby the distinct characteristics of each
set of communications is maintained.
14. In a system‘ i’or simultaneously transmit ‘
-
‘19. In a telephone system for inductively re
_ an air gap from one of said conductors of the in
40
termediate circuit and, together with said con
ductor, constitutes -an electrical transformer of>
which the winding serves as primary‘winding and
` stretchbf track'for the train, train carried means ,
14s for simultaneously transmitting and receiving the' conductor as secondary, and receiver means
ting a plurality of sets of .communications be
' tween a railway train and a wayside station, a`
separate sets oi communicationsfwayside station l carried on said'train'in circuit with said wind
ing adapted to he- reeponsiveto a plurality of
in said
ceiving said'sets 9i! communications, means elec .currents of dinerent frequencies
_
_
' trically coupled with said train carriedy means and intermediate circuit.’
¿20. In combination. a railway train. rails in
‘controlled by the presence of the train in said~
>means for simultaneously transmitting and re- '
stretch forming a communication none for said .the track for'said train to run on, means located
tràin to which the said sets of communications at one point on the train for transmitting modu
for and from said train are coniined, and means ’ lated carrier frequency’current into a circuit
operative from the wayside station for placing which includes said running rails therein in mul- .
said wayside station in communicative relation , tiple, and means located at a point remote from
Ísaid train point and associated'with said- circuit
> withÍ the means forming said sone.`
_
15. In a system for simultaneous communica- ’ ` responsive to said carrier frequency current ilow
ing_in'said-circuit due to said lfirst mentioned Y
stretch of track, means on each train adapted
. 2l. Inasystemof communication for railways,to transmit communications to and receive com
munications. from _ the wayside. means on the a transmitter at -one station adapted to-transmit
wayside adapted to simultaneously transmit and electric current ofv carrier frequency. modulated
tion between the wayside and'railway _trains in a
receive a plurality ofl communications. one _for
with electric veur-rent of other frequencies.v a re
means and electrically.controlled=from said way- .
responsivetosaidcar'riercurrentantladaptedto.`
each train, and means associated with each train .ceiver in a station remote from saidone station
sidefor placing said wayside means in communi- » demodulatethegsamejand-_a circuit including-the
cative relation with the said means on each et a running `rails of the railway track adaptedto‘re
plurality'of said trains»
'
`
16.'In a system for a plurality of communica
-70 `tionssimultaneously'carried on' between vehicles
-ina'section'oftrachmeansoneachvehiclc
i
aadapted.
plurality
to of
simultaneously
communications. a conlnunication
sone for said vehicles lwithin which communica
.__
oeivesaidcarriercurrent-fromthetransmitter
at the‘on'e station fand'to `transmit', saidrcarrier
current to the receiver at said remote station.. '1e
-saidcarriercurrent'ncwingzin'therunning-raih ' -_.
in-thes'amedirectienatanyfinstantandreturn-~
lng tothe point It
u tionsbetweensaidvehicleeare‘coniinetand~ ningraib.
.ï
intotheril“
.1.
arouse
- _
28. In a train operating system, in combination,
22. In a train telephone system, a stretch
Vtrack for a train, a train on the track. a trans( `a railway line, a plurality of vehicles on said
j mitting‘ device comprising afcarrier current gen- ' line, a wayside station, apparatus at said station
erator and a modulator at one point on the train, .for transmitting to ‘each vehicle electric current
a receiving device at another _point on the train, oi' distinctive character. said current being dif
and a circuit for conducting current from said ferent i'or- each vehicle, a receiver 'on each vehicle
transmitting device to said receiving device com
responsive only to, >'current intended ionl'that
jprising the two track rails and a common return vehicle', and a circuit in electrical relation with
"path so related to said rails that current flows the apparatus at said station and the receiver on
`through the rails in muitipleyto points substan- . each vehicle for conveying said currents from the 10
Vstation to the respective vehicles.
-tially aheadof and in rear ci the train. '
23. In a train telephone system, a stretch of“
,
‘ 27. In a system for simultaneous transmission
track for a train, a train -on the track, a trans-_ „ to arailway train of an electric current of audio
frequency and an electric current oi' ~-radio ire
erator and a modulator on the train, a receiving quency from diñerent wayside stations, in com
` f ‘ »mitting device comprising a carrier current gen
device on the train, a wayside station, a trans- l bination,_a stretch of track for the train, re
ceiving apparatus on the train selectively respon
_ mitting device comprising a carrier current vgen
erator and a modulator at said station, a receiv
sive to each of said currents, a plurality oi’ -way
` `ing device at said station, a circuit associated \
sidestations, apparatus at one oi‘said stations
for transmitting electric current o! radio ire
-with said train carried >devices comprising the
~ two track rails and a common return path'so vre
lated to the rails? that _current flows through the
rails in multiple to points substantially ahead.
1
‘ of and'in the rear oi' the train, and a r'second
circuit connecting- said i'irst circuit to said way
side station devices.
y
.
2_4. In a system tortransmitt'ing one set ot sig'
nals between two vehicles voi’ a railway train and
another set of signals between one of said vehi
cles. and a wayside station. in combination, a cir
20
quency, apparatus at another station for trans- '
mitting electric current of audio frequency, and an intermediate circuit in electrical relation with
said train.
f
»
2a. The combination-with a stretch or track,
_and attain operating thereon, of two >locations
cuit carried on one oi' >said ’vehicles for transmit- . spaced apart on the train. a transmitting circuit ‘
ting and receiving two sets of signals, each -of -a
`diñerent current frequency, a circuit carried on
including a generator of current _of a predeter
mined frequency at each location, a receiving t
theother of said vehicles for transmittingl and
‘_ receiving a set of signals of current otone of said
circuit at each location including a filter tuned
vtransmitting and receiving a set of-signals of
mission _ circuit continuously connecting 'said
to pass'only current of' theirequency of the
‘ frequencies, a circuit, at’ a wayside station" 'for _ generator at the opposite station, and a trans
‘ the other oi' said frequencies. and an intermedi.
transmitting vand receiving circuits as, the train
ate circuit including the track rails in multiple ~ moves along said track„ said transmission cir
‘
electrically connecting the transmitting and re
cuit comprising the twoëtrack _rails in multiple
‘ceiving-circuitso! said vehicles‘and said wayside
and a common return path.
station for conducting the signal currents _theref .
»
-
29; In a system- for simultaneously transmi -
ting a plurality oi’ non~conñicting sets of com?`
Vmunications between a railway train and the
ways, in combination, a stretch oi railway track, wayside in which a separate frequency band 'of
between.
_
_
_
»
v
v_
' 25. In an electric transmission system for rail
a ilrst station anda second station each associ-f electric current is employed for transporting each
_ated‘withvsaid stretch oftrack at points remote> set of said communications, means carried on
`from Aeach other,l a transmitter at said first sta
said, train and means located on the wayside- for
tion vadapted’to transmit `electric current ot car-v supplying, transmitting and receiving saidbands
rier «frequency modulated with current of a dit- ‘ of current frequencies on the train and on the
ferent frequency, receiving apparatus at said sec wayside, respectively, circuit‘rneans on the way- I
ond- station. responsive -to said carrier current and
side Ior receiving the transmitted current from
arranged to _demodulate-said current, 'and a cir
either said train or-said wayside, and means
operable to place said train means -in electric
cuit for conducting the current from said trans
mitter .to said
apparatus comprising the
two track` rails _and a lcommon _return path so re
lated to the rails that the current from the trans
mitter i'iows to the receiving apparatus through
the track
multiplaf
_ ‘
said receiving apparatus on said train and
adapted to be connected to lthe transmitting ap 25
paratus at said wayside stations for carrying the
electric signal currents between said stations and
relation with _said wayside means via said circuit
-means for the transference,«.between,. said train
-_and said wayside‘oi'one or. more than one of j
said‘irequency bands.
~
_
;
,
I ~.
ARCHIBALD G. BEAVER,
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