Word Study
signalman
CIDE DICTIONARY
signalman, n.
A man whose business is to manage or display signals; especially, one employed in setting the signals by which railroad trains are run or warned. [1913 Webster]
OXFORD DICTIONARY
signalman, n. (pl. -men)
1 a railway employee responsible for operating signals and points.
2 a person who displays or receives naval etc. signals.
1 a railway employee responsible for operating signals and points.
2 a person who displays or receives naval etc. signals.
For further exploring for "signalman" in Webster Dictionary Online