The Fat Controller
Sir Topham Hatt, also known as The Fat Controller, is the controller of the North Western Railway on the island of Sodor. He sometimes works on the steam engines himself, and as a young man he drove a steam-powered lorry named Elizabeth. Perceptive and shrewd, he has used elaborate schemes to get to the bottom of a problem. He is known in the series for his catchphrases "You are a really useful engine" when he is proud of his engines and "You have caused confusion and delay" when one of his engines messes up on something. He also scolds his engines.