B - Operations – Transporting – 61 – L
Patent
B - Operations, Transporting
61
L
346/33
B61L 13/04 (2006.01) B61L 1/18 (2006.01) B61L 3/22 (2006.01)
Patent
CA 1080840
JOINTLESS WHICH FREQUENCY TRACK CIRCUIT SYSTEMS FOR RAILROADS Abstract of the Disclosure A jointless high frequency track circuit system is provided, for communication of signals through track rails of a stretch of railway track, having a high frequency track circuit transmitter and receiver and a cab signal transmitter coupled across track rails at each of several locations marking the ends of track sections along a stretch of railway track. Each location has an impedance bond having a primary winding connected across the track rails and having toroid secondary windings tuned to assigned distinctive high frequencies for coupling a track transmitter and a track receiver to the track rails. A loop circuit is also provided at each location, including a tuned loop, for inductively coupling a cab signal code trans- mitter to the track rails independent of the impedance bond. The tuned toroid coils and the loop circuit are connected in series to one end of a two wire line circuit, which, at its other end, is connected to a track circuit high frequency transmitter, a track circuit receiver, and a cab signal trans- mitter connected in multiple.
287610
Frielinghaus Klaus H.
Wilcox Clinton S.
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