Track signalling system

Details Track signalling system Track signalling system

B - Operations, Transporting

61

L

346/32

B61L 27/00 (2006.01) B61L 23/16 (2006.01)

Patent

CA 1086848

TRACK SIGNALLING SYSTEM ABSTRACT OF THE INVENTION A track circuit signalling system for an electrified rapid transit system using significantly fewer components is disclosed. Instead of a transmitter and receiver at each track circuit boundary, alternate boundaries have transmitters only; and the intermediate boundaries have two receivers. The coupling units for the two receivers are more economical than the prior art coupling unit for coupling the transmitter- receiver combination. The transmitters on each side of a re- ceiver pair transmit signals on different carrier frequencies. Each transmitter transmits in both directions from its location. Of the two receivers at a given boundary, one is tuned to re- spond to signals from the transmitter on one side, while the other receiver of the pair is tuned to respond to signals from the transmitter on the other side. For special applications using overlapping track circuits, selected transmitters may be omitted and a single receiver used on each side of the omitted transmitter.

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