also: しんごうしょ
noun
signal station
A facility or building from which signals (especially railway signals) are controlled.
この路線には小さな信号所がいくつかある。
There are several small signal stations on this line.
信号所の職員が列車の進路を切り替えた。
The signal station staff switched the train's route.
信号場 is a passing loop or signal station on a railway, often used interchangeably but 信号所 emphasizes the building or facility itself.
Compound of 信号 (signal) and 所 (place, station).