Word:

Block signal

1.(Railroads) 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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block anaesthesia
block and tackle
block anesthesia
Block book
block capital
Block chain
block diagram
Block Diagram Compiler
block grant
block letter
block of metal
block off
block out
block plane
Block printing
Block Redundancy Check
-- Block signal --
Block Started by Symbol
Block system
Block tin
block transfer computations
block up
block vote
Blockade
blockade-runner
blockaded
Blockader
blockading
Blockage
blockbuster
blocked
blocked records
blocker
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