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.
Over time, he became legendary; many knowing of the "old warrior ghost" haunting the mine. However, Toby found him while watching over the quarry one night, and has since befriended him. He now works at the restored mines, taking passengers to the fairground within.