Railroad grade crossing constant warning protection system

Details Railroad grade crossing constant warning protection system Railroad grade crossing constant warning protection system

B - Operations, Transporting

61

L

346/49

B61L 23/00 (2006.01) B61L 29/28 (2006.01)

Patent

CA 1147838

(Case No. 7022) ABSTRACT OF THE DISCLOSURE A train detection system for protecting a railroad highway crossing having an a.c. transmitter center-feeding voltage signals into the track rails and having a receiver including at least a pair of coils located on opposite sides of the crossing and disposed adjacent the track rails for defining an inland zone and for inductively picking up a.c. signals when the island zone is unoccupied and determines the time of arrival of a train at the crossing.

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