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block signal

a fixed railroad signal governing the movements of trains entering and using a given section of track.
Origin of block signal
First recorded in 1880-85
Related forms
block signaling, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for block signal
Historical Examples
  • The sergeant's hand snapped up to salute like a block signal.

    Three Soldiers John Dos Passos
  • The block signal even with the train staff or the train tablet is far from perfect.

  • The scuttlebug automatically reversed and began slowing for the end of its run—tripped by a block signal set in the ribbon cable.

    Where I Wasn't Going Walt Richmond
  • Trains moving on caution card must expect to find main track occupied at all stations regardless of the position of block signal.

    Railroad Accidents R. C. Richards

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