Fowler's Ghost

Fowler's Ghost was the nickname given to an engine who was built to work on the London Underground, but failed, and now haunts Britain's railways, the Island of Sodor and Equestria as a ghost.

Trivia

 * Fowler's Ghost will encounter Thomas and Twilight Sparkle in a Thomas and Twilight Sparkle's Adventures Chronicles Halloween special, The Curse of Fowler's Ghost.