Culdee is a Purple Narrow Gauge Mountain Engine. He is named after The Railway his rails climb, previously He is named after Culdee Fell. He has his own mountain coach named Catherine and his own tool van.
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.
Things are going wrong in 2000, The Culdee fell Railway has become more older and older for a long time, so the manger has to close it down for good. All of his friends were sent to the mainland to their new home, but Culdee and his coach Catherine has to stay on Sodor and were sent to the works to be overhauled into a Standard gauge, (This will be same like The Indian Mountain Railway Standard gauge, Like Ashima).
In 2016, Culdee and Catherine were Back on Sodor, There is a Renamed of his Railway called: Culdee fell Heritage Railway.
- Season 4: Catherine's Story and The Unseen Diesels
- Season 6: Officer Murdoch
- Season 7: Molly's Folly
- Season 14: Hiro and the Heat Wave (cameo), Merlin the Magical Engine (cameo) and Dirty ‘Arry (cameo)