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Bible Dictionaries
Block Signal

Webster's Dictionary

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One of the danger signals or safety signals which guide the movement of trains in a block system. The signal is often so coupled with a switch that act of opening or closing the switch operates the signal also.

Bibliography Information
Webster, Noah. Entry for 'Block Signal'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​b/block-signal.html. 1828.
 
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