Tidmouth Sheds are the main engine sheds on Sodor. In the Railway Series, it is shown as a shed with three or four rails leading in (the illustrations were inconsistent), but in later books it was depicted as a shed enclosing ten berths around a turntable.
Many events have taken place at the Sheds, such as the strike of the big engines and the confrontation between Duck, Diesel, and the big engines.