signal box

noun British.
a railway signal tower.

1820–30 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
signal box
1.  a building containing manually operated signal levers for all the railway lines in its section
2.  a control point for a large area of a railway system, operated electrically and semiautomatically

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
The live picture is linked to the traffic signal box.
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