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POS
CIDE DICTIONARY
block letter | block of metal | block off | block out | block plane | block signal | block system | block tin | block up | block vote | blockade

block signal

RELATED WORDS :


 : 
Noun Phrase

CIDE DICTIONARY

block signal,  
     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.  [Webster 1913 Suppl.]

For further exploring for "block signal" in Webster Dictionary Online


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