Master-Satellite railway track circuit

Details Master-Satellite railway track circuit Master-Satellite railway track circuit

1991-03-27

1992-09-08

Spar, Robert J.

Railway switches and signals

Train-position indication

Miniature model

246 34R, B61L 2502

Patent

active

051451310

ABSTRACT:
A railway track circuit for protection of an extended track block having a master unit at one end of the block and a satellite unit at the other. Each master and satellite unit having transmitting and receiving capabilities. The output impedance of the transmitters or of the receivers is of a low impedance as connected to the rails. Through an alternative transmit and receive sequence a link-up between the master and satellite units provides detection of broken rail and/or shunts from each end of the track circuit. The use of low impedance and detection at both ends of the section permit extended length track circuits.

REFERENCES:
patent: 3246141 (1966-04-01), Ehrlich
patent: 3359416 (1967-12-01), Wilcox
patent: 3696243 (1972-10-01), Risely
patent: 3753228 (1973-08-01), Nickolas et al.
patent: 3821544 (1974-06-01), Matty
patent: 4320881 (1982-03-01), Campbell
patent: 4415134 (1983-11-01), Wilson
patent: 4498650 (1985-02-01), Smith et al.
patent: 4619425 (1986-10-01), Nagel
patent: 4723739 (1988-02-01), Franke
patent: 4728063 (1988-03-01), Petit et al.
patent: 4886226 (1989-12-01), Frielinghaus

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