Railroad grade crossing constant warning protection system

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

1979-07-30

1981-12-29

Salce, Patrick R.

Railway switches and signals

Electric automatic highway signals, mine doors, and gates

Normally open track circuit

246125, B61L 2928

Patent

active

043078605

ABSTRACT:
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 island 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.

REFERENCES:
patent: 3333096 (1967-07-01), Ohman et al.
patent: 3734434 (1973-05-01), Smith
patent: 3951364 (1976-04-01), Sibley
patent: 3977634 (1976-08-01), Smith

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