Bertram, nicknamed "the Old Warrior", but misspelled as "Bertrum" for his bravery, is an old narrow-gauge engine who worked in a quarry on the far side of Sodor.
Bertram used to work in a series of mines with other "little engines". His fate was unknown to many after the mine's closure, and it was assumed he was left to rust. However, Toby found him whilst watching over the quarry one night, and has since befriended him. He now works at the restored mines, taking passengers to the fairground within.
- Normal (2000)
- Bertram was supposed to be a tank engine, so the model makers recycled Duke's body and used Smudger's face in the show. Because of this, Bertram's model is recycled from Duke's, his prototype even having his face.