During the first day of the evacuation of civilians during World War II, the locomotive hauled trains carrying children being taken from London to the safety of the countryside.
Nunney Castle was also used to haul the Royal Train in October 1957 from London Paddington station to Gloucester.
5029 was initially allocated to Old Oak Common MPD (code PDN/81A) in West London where it was to spend most of its working life.
Nunney Castle was sold in 1964 to Woodham Brothers at Barry, Vale of Glamorgan, arriving at the famous scrap yard in June where it was to languish for 12 years.
Sold to a consortium consisting of private individuals (50%) and the Great Western Society at Didcot Railway Centre (50%), it was rescued from Woodham's in May 1976, and was the last loco to leave Barry scrapyard by rail.