Bert is a small blue tender engine who is the quietest and oldest of the Arlesdale Railway engines.

Bert is the quietest of the Arlesdale Railway engines. He appears to be very easy going and friendly. One thing Bert does not like, however, is the idea that bigger engines (and some people) might look down on the little engines just because they are small. He is still friendly to bigger engines, and usually corrects them when they look down upon smaller engines. Bert usually gets on with his jobs without complaining and does not mind what kind of work he does as long as he is treated with respect.