Multiplexing means for motion detectors at grade crossings

B - Operations – Transporting – 61 – L

Patent

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346/53

B61L 29/28 (2006.01)

Patent

CA 1133103

MULTIPLEXING MEANS FOR MOTION DETECTORS AT GRADE CROSSINGS ABSTRACT OF THE DISCLOSURE At a railroad crossing, a single motion detection unit is selectively coupled to an occupied track in such manner that safe, effective and efficient control is obtained over the crossing alarm device. The means for coupling the motion detection unit includes means for terminating the activation of the crossing alarm device when a train stops on the approach track, but short of the actual intersection. Techniques for multiplexing a motion detection unit with plural tracks at the grade crossing or with multiple track circuits on a single track are provided. Safe operation is assured with multiple track occupancy irrespective of the sequence of occupancy and which is the last to remain occupied or if one of the trains stops or reverses direction of motion.

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