- 1. 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. Source: webster
- 2. One of the danger signals or safety signals which guide themovement of trains in a block system. The signal is often so coupledwith a switch that act of opening or closing the switch operates thesignal also. Source: adambom
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block signal
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block bookblock capitalblock chainblock diagramblock grantblock heelblock letterblock offblock outblock planeblock system
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