signal box

noun British.
a railway signal tower.

Origin:
1820–30

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
signal box
 
n
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
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Example sentences
The live picture is linked to the traffic signal box.
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