CA971262A - Detector track circuit for railroad crossings - Google Patents

Detector track circuit for railroad crossings

Info

Publication number
CA971262A
CA971262A CA183,725A CA183725A CA971262A CA 971262 A CA971262 A CA 971262A CA 183725 A CA183725 A CA 183725A CA 971262 A CA971262 A CA 971262A
Authority
CA
Canada
Prior art keywords
track circuit
railroad crossings
detector track
detector
crossings
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
CA183,725A
Other versions
CA183725S (en
Inventor
Reed H. Grundy
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.)
Westinghouse Air Brake Co
Original Assignee
Westinghouse Air Brake Co
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 Westinghouse Air Brake Co filed Critical Westinghouse Air Brake Co
Application granted granted Critical
Publication of CA971262A publication Critical patent/CA971262A/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
    • B61L1/185—Use of direct current

Landscapes

  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Mechanical Engineering (AREA)
  • Train Traffic Observation, Control, And Security (AREA)
CA183,725A 1972-12-08 1973-10-18 Detector track circuit for railroad crossings Expired CA971262A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00313608A US3819933A (en) 1972-12-08 1972-12-08 Detector track circuit for railroad crossings

Publications (1)

Publication Number Publication Date
CA971262A true CA971262A (en) 1975-07-15

Family

ID=23216406

Family Applications (1)

Application Number Title Priority Date Filing Date
CA183,725A Expired CA971262A (en) 1972-12-08 1973-10-18 Detector track circuit for railroad crossings

Country Status (3)

Country Link
US (1) US3819933A (en)
AU (1) AU5414273A (en)
CA (1) CA971262A (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ZA743701B (en) * 1974-06-11 1975-06-25 Western Industries Pty Improvements in electrical detective circuits
US3958782A (en) * 1975-02-06 1976-05-25 General Signal Corporation Shunt enhancement logic circuit
GB8320509D0 (en) * 1983-07-29 1983-09-01 Westinghouse Brake & Signal Proving safe operation
DE69224647T2 (en) * 1992-07-16 1998-08-27 Esashi Masayoshi Failsafe logic circuit with electro-magnetic coupling
US5737173A (en) * 1994-04-29 1998-04-07 Safetran Systems Corporation Railroad track circuit vital relay control
US7296770B2 (en) * 2005-05-24 2007-11-20 Union Switch & Signal, Inc. Electronic vital relay
CN101320654B (en) * 2008-05-23 2011-08-31 淮南矿业(集团)有限责任公司 Voltage step track relay
CN103640597B (en) * 2013-12-03 2015-12-16 合肥工大高科信息科技股份有限公司 A kind of two get two continuous exchange of track circuit and method of inspection thereof
US10202132B2 (en) * 2017-03-17 2019-02-12 Alstom Transport Technologies Monitoring device for monitoring a railway track, associated method and monitoring system for monitoring a railway track

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2464279A (en) * 1947-09-26 1949-03-15 Abe M Zarem Circuits for pulsing essentially capacitive loads
US2887570A (en) * 1954-09-10 1959-05-19 Leroy Emile Marcel Pierre Railway track circuit-signalling system
US3670161A (en) * 1970-05-04 1972-06-13 Gen Signal Corp Combined high and low frequencies for track circuit
US3683176A (en) * 1970-07-21 1972-08-08 George B Crofts Presence detector

Also Published As

Publication number Publication date
AU5414273A (en) 1974-10-10
US3819933A (en) 1974-06-25

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