A Signalman is a person who historically gave signals using flags and light. In modern times the role of Signalmen has evolved and now usually uses electronic communication equipment. Signalmen usually work in rail transport networks, armed forces, or construction (to direct heavy equipment such as cranes). However, many armed forces now use the rank of Signaller

Signaller

In the armed forces, a signaller or signaleer is a specialist soldier or seaman or airman responsible for military communications. Signallers, aka Combat Signallers or signalmen or women, are commonly employed as radio or telephone operators, relaying messages for field commanders at the front line...

 instead.

Signalman may also refer to:

• Signalman (rank)
  Signalman (rank)
  Signalman was a U.S. Navy rating for sailors that specialized in visual communication. See Signaller for more about the roles of Signalmen.-U.S. Navy:A signal lamp is a visual signaling device for optical communication...
  
  , the military rank
• Signalman (rail)
  Signalman (rail)
  A signalman or signaller is an employee of a railway transport network who operates the points and signals from a signal box in order to control the movement of trains.- History :...
  
  , a railwayman who operates the points and signals in a railway signal box
• The Signal-Man
  The Signal-Man
  The Signal-Man is a short story by Charles Dickens, first published as part of the "Mugby Junction" collection in the 1866 Christmas edition of All the Year Round....
  
  , a short story by Charles Dickens
• Signalman (comics)
  Signalman (comics)
  Signalman is a fictional supervillain published by DC Comics. He first appeared in Batman vol. 1 #112 , and was created by Bill Finger and Sheldon Moldoff.- Fictional character biography :Phillip "Phil" Cobb was a gangster with big ideas...
  
  , a villain in the Batman comics
• A ranger-like ally in Gekisou Sentai Carranger
  Gekisou Sentai CarRanger
  is a Japanese tokusatsu television show. It was Toei's twentieth production of the Super Sentai television series. Its action footage was used in Power Rangers Turbo.-Plot:...
  
  
• Signal person or signalperson, a construction job in which one directs heavy equipment such as cranes using hand signals and/or voice commands