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block system

noun, Railroads.
1.
a series of consecutive blocks.
Compare block (def 22).
2.
a system of blocks and block signals for controlling train movements.
Origin of block system
1860-1865
1860-65
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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Word Value for block

13
16
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