Bible Dictionaries
Detector bar
Webster's Dictionary
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.
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Bibliography Information
Webster, Noah. Entry for 'Detector bar'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/d/detector-bar.html. 1828.