GB1349651A - Electrical signalling for railways - Google Patents

Electrical signalling for railways

Info

Publication number
GB1349651A
GB1349651A GB6062670A GB1349651DA GB1349651A GB 1349651 A GB1349651 A GB 1349651A GB 6062670 A GB6062670 A GB 6062670A GB 1349651D A GB1349651D A GB 1349651DA GB 1349651 A GB1349651 A GB 1349651A
Authority
GB
United Kingdom
Prior art keywords
track
frequency
sections
signals
receiver
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB6062670A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ML Engineering Plymouth Ltd
Original Assignee
ML Engineering Plymouth Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ML Engineering Plymouth Ltd filed Critical ML Engineering Plymouth Ltd
Publication of GB1349651A publication Critical patent/GB1349651A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L1/00—Devices along the route controlled by interaction with the vehicle or train
    • B61L1/18—Railway track circuits
    • B61L1/181—Details
    • B61L1/187—Use of alternating current
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L23/00—Control, warning or like safety means along the route or between vehicles or trains
    • B61L23/08—Control, warning or like safety means along the route or between vehicles or trains for controlling traffic in one direction only
    • B61L23/14—Control, warning or like safety means along the route or between vehicles or trains for controlling traffic in one direction only automatically operated
    • B61L23/16—Track circuits specially adapted for section blocking
    • B61L23/166—Track circuits specially adapted for section blocking using alternating current

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Train Traffic Observation, Control, And Security (AREA)

Abstract

1349651 Track circuit M L ENG (PLYMOUTH) Ltd 16 Dec 1971 [21 Dec 1970] 60626/70 Heading B7N In a track circuit arrangement for continuous track carrying return traction current having a fundamental frequency or ripple frequency F, the track circuit transmitter switches periodically between two frequencies, the first of which coincides with a harmonic of the fundamental F and the second is spaced from the first by a frequency gap NF + (F/2) where N is an integer and the track circuit receiver actuates its track relay in response to reception of at least one of the signals. Should the traction current frequency drift from its nominal value F at least the first signal is transmitted to the receiver without interference, if it remains at the nominal frequency then at least the second signal which is disposed between two harmonics reaches the receiver free of interference. Transmitter 4 feeds two track sections B1, B2 with a signal alternating between frequencies f3, f4 and receivers 7, 8, at the other ends of the sections, each include two channels tuned respectively to f3 and f4. Reception of either or both signals operates the associated track relay. Adjacent pairs of sections operate at different frequencies and each transmitter forms a low impedance shunt to signals transmitted from adjacent sections. The track signals can be modulated for transmission of information to trains.
GB6062670A 1970-12-21 1970-12-21 Electrical signalling for railways Expired GB1349651A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB6062670 1970-12-21

Publications (1)

Publication Number Publication Date
GB1349651A true GB1349651A (en) 1974-04-10

Family

ID=10485834

Family Applications (1)

Application Number Title Priority Date Filing Date
GB6062670A Expired GB1349651A (en) 1970-12-21 1970-12-21 Electrical signalling for railways

Country Status (4)

Country Link
AU (1) AU465109B2 (en)
FR (1) FR2118946B1 (en)
GB (1) GB1349651A (en)
ZA (1) ZA718433B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4582279A (en) * 1983-01-13 1986-04-15 Alsthom-Atlantique Modulation system for railway track circuits
GB2400222A (en) * 2003-04-01 2004-10-06 Trevor Edwin Clegg Railway train detection system
WO2008052643A2 (en) * 2006-10-30 2008-05-08 Siemens Schweiz Ag Method and device for evaluation of measurement data in railway track circuits

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK492180A (en) * 1979-11-28 1981-05-29 Licentia Gmbh DEVICE FOR CLAR ALARMING OF RAILWAY

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4582279A (en) * 1983-01-13 1986-04-15 Alsthom-Atlantique Modulation system for railway track circuits
GB2400222A (en) * 2003-04-01 2004-10-06 Trevor Edwin Clegg Railway train detection system
GB2400222B (en) * 2003-04-01 2005-11-30 Trevor Edwin Clegg Railway train detection system
WO2008052643A2 (en) * 2006-10-30 2008-05-08 Siemens Schweiz Ag Method and device for evaluation of measurement data in railway track circuits
WO2008052643A3 (en) * 2006-10-30 2008-06-26 Siemens Schweiz Ag Method and device for evaluation of measurement data in railway track circuits
TWI393648B (en) * 2006-10-30 2013-04-21 Siemens Schweiz Ag Method and device of evaluating measured data in railroad track circuits

Also Published As

Publication number Publication date
AU465109B2 (en) 1975-09-18
AU3703671A (en) 1973-06-21
FR2118946A1 (en) 1972-08-04
FR2118946B1 (en) 1977-01-28
ZA718433B (en) 1972-09-27

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee