Akademik

signal tower
noun
a building from which signals are sent to control the movements of railway trains
Syn: ↑signal box
Usage Domain: ↑Britain
Hypernyms: ↑building, ↑edifice

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noun
: an enclosed or armored elevated structure from which signals are displayed or controlled; specifically : a switch tower for a system of railroad signals

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signal tower,
a tower from which signals are sent or displayed, as by a semaphore.

Useful english dictionary. 2012.