detector bar

Detector bar

De*tect"or bar\ (Railroads) A bar, connected with a switch, longer than the distance between any two consecutive wheels of a train (45 to 50 feet), laid inside a rail and operated by the wheels so that the switch cannot be thrown until all the train is past the switch.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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