Beau

Note: This character’s name is actually pronounced “Bo”. Beau is a mining engine depicted with a moustache, who works at the Grand Canyon. Hailing from the American wild west, this gritty old-timer was able to help Thomas when he was derailed, fixing himself in Thomas' memory and making him forever grateful.

LOTM Storyline
He claims to have once yelled at Bandit Keith and scared him away, though this is subject to varying levels of belief.