Proteus is a mysterious yellow tank engine with a lamp bolted tightly to his funnel who works on the Alun Railway.
Proteus was built at Falcon Works in 1878. After many days of waiting in the workshop, he was finally brought to the Alun Railway.
Proteus may come across as slightly bonker, believing his lamp to be magic! But beneath this mad exterior lie the heart of a kind little engine whose only wish is to have his fantasies realised. His easygoing charm and unquestionable loyalty lead him to become firm friends with Bertram.