Scruff was created by ExpiTheCat in late 2010, and is one of his oldest released models. Scruff was inspired by a character from the show Thomas & Friends. Scruff's model is very basic and inaccurate, due to its age and ExpiTheCat creating it as an inexperienced child. The Scruff model was later repainted to create three other diesels. Scruff is the only of the four diesels to have a black front end.