Detector bar

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 1913 Suppl.]

The Collaborative International Dictionary of English. 2000.

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