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block signal

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block signal

 
Use block signal in a Sentence
–noun
a fixed railroad signal governing the movements of trains entering and using a given section of track.
Origin:
1880–85

Related forms:
block signaling, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Block Signal
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block signal  
n.  A fixed signal at the entrance to a railroad block, indicating whether or not trains may enter.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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