Signalmen work on the railways of Sodor, controlling the points and signals that send the engines to their destinations. They work in the signal-boxes.
Occasionally signalmen fall asleep on the job, resulting in accidents.
- Keith Wickham (UK/US; eighteenth season onwards)
- Nozomu Sasaki (Japan; The Adventure Begins)
- Kunihiro Kawamoto (Japan; The Other Side of the Mountain)
- To date, only two signalmen have been named: Mr. Edwards and Simon.
- Brio (discontinued)