Bible Dictionaries
Block Signal
Webster's Dictionary
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.
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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.