Mike is a small strong red engine who prefers goods trains to passengers. He is the youngest out of the original three Arlesdale Railway engines.

Mike means well and works hard, but can sometimes appear a little cunning and arrogant. He thinks he should be in charge of the other two engines, though neither of them really let him boss them around. Bert simply humours him, but Rex goes out of his way to tease Mike and wind him up, which is not very difficult given the fact that he is hot-headed. Mike much prefers pulling goods trains to passengers, unlike Gordon, as he considers goods much more straightforward and less likely to complain. He is proud of his strength and appears rather confident, but he would not be so easy to tease if he was not hiding at least a little insecurity. He can sometimes be a little argumentative and irritable and it is common for him to overheat when he loses his temper.