Hypertext Webster Gateway: "Signalman"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Signalman \Sig"nal*man\, n.; pl. {-men}.
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.
From WordNet (r) 1.7 (wn)
signalman
n : a railroad employee in charge of signals and point in a
railroad yard
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