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Thomas and Friends revolves around the railway engines that live on the Island of Sodor. The show is mainly about the title character, Thomas, a cheeky little blue tank engine with six small wheels, a short stumpy funnel, a short stumpy boiler, and a short stumpy dome. Thomas and Friends takes place on the standard gauge North Western Railway and the narrow gauge Skarloey Railway. The head of the North Western Railway is Sir Topham Hatt, affectionately nicknamed "The Fat Controller" by the engines and staff. The Skarloey Railway is operated by Mr. Percival, "The Thin Controller". Since the second season, there has been a rivalry between the steam and Diesel engines.