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Sir Haydn was built in 1878 by Hughes' Loco and Tramway Engine Works Ltd. He worked on the nearby Corris Railway until the closure of that line in 1948. In 1951, he was purchased by the Talyllyn Railway, along with the other surviving Corris locomotive, who became Edward Thomas, and was named after the line's late owner, Sir Henry Haydn Jones. The precarious state of the track meant he was seldomly used for the first few years, and firebox problems caused his withdrawal in 1957. He re-entered service in 1968.
- In 1968 Sir Haydn was painted in a white livery.
- At times, Sir Haydn visits the old Corris Railway.
- Sir Haydn is currently undergoing a rebuild. For more information, visit http://www.talyllyn.co.uk/loco-3-appeal
- He is one of two locomotives to have the same number for four different railways: Corris Railway, Great Western Railway, British Railway and now Talyllyn Railway, Edward Thomas is the other one.
- Sir Haydn is the basis of Sir Handel from Thomas & Friends.