Built in 1878 for the Corris Railway in Wales, Sir Haydn was employed in passenger and goods service until the line’s closure in 1948, operating as Corris No. 3 under both independent ownership and as part of the Great Western Railway. In 1951,
No. 3 was purchased by the newly formed Talyllyn Railway Preservation Society and was relocated to the nearby operation. It was here that the name “Sir Haydn” was given in recognition of the former owner of the Corris Railway. Today, Sir Haydn operates alongside the Talyllyn locomotive in excursion service and occasionally returns as a visiting locomotive to the Corris Railway, which has since reopened as a heritage operation.