Bertram, nicknamed "The Old Warrior" for his bravery, is an old engine who worked in a quarry on the far side of the island. He currently works on the Mid Sodor Railway.
Bertram arrived on Sodor as the same time as Duke, Mistress, Pioneer, and Shire Horse and worked on the Mid Sodor Railway. Bertram used to work at the Sodor Bat Mines, His fate was unknown to many after the mine's closure, and it was assumed he was left to rust. He remained at the mine until he was rediscovered years later.
Over time, he became legendary; many knowing of the "old warrior ghost" haunting the mine. 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.