Culdee was built at the Swiss Locomotive and Machine Works in Winterthur, Switzerland, and arrived on Sodor in time for the railway's inspection. In March 1900, he was the first to be used in the test runs on the Culdee Fell Railway. When Lord Harry was delivered in March 1962, Culdee left for overhaul instead of Shane Dooiney as he was the most run down of the two. He arrived back on Sodor in May 1963, which is where the first story of Mountain Engines begins.
The Island of Sodor was going wrong in 2009, then Culdee was on his way to the Culdee Fell Summit but a strange looking man was going to destroy the railway, and so, the other mountain engines fell off the mountain and Culdee derailed himself, and that, Culdee was sent to the works for a rebuild.