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:
1860–65

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
And the one-box-per-block system radically decreases the necessary
  infrastructure, also a big win.
There is a composite block system on the market that can be used for
  verification purposes only.
His development of concrete blocks into what he called the textile-block system
  illustrates this approach.
Conducted a test run on the two-block system and it is functioning properly.
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