Why does Culdee from Thomas and Friends have two faces?

\nThe Island of Sodor isn’t all flat land and countryside, there are mountains too. The trains of one railway are dedicated to traveling the narrow bends and sharp curves… of those mountains. Culdee works for The Culdee Fell Railway, and that’s how he got his name. Chugging along slow and steady, Culdee is always ready to give advice to other engines on the mountain.\n. \nCuldee’s two faces at either end of his body keep him alert to the dangers lurking in the mountains. His bright purple tank with red stripes makes him stand out among the trees. A sensible mountain railway train, Culdee pulls a forklift and apple car cautiously behind him. ( Full Answer )