'Detector bar' definitions:
Definition of 'Detector bar'
From: GCIDE
- 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.]