A signalman is a person who works with signals, typically in the transportation industry, to communicate messages or instructions to control the movement of vehicles such as trains, planes, or ships. Full definition
The Claimant, Mr D. Crawford, was a railway signalman who worked from different one - manned signal boxes over the course of an 8 hour shift. (stevens-bolton.com)
Trends in eBooks and Digital Publishing John McClure, Publisher, Signalman Publishing (christianpublishers.net)
The trick was to be asleep before the rail signalman whispered in with his latest girl off the midnight train (firstthings.com)