Number 7028 Cadbury Castle was a Great Western Railway 4073 Castle class 4-6-0 steam locomotive built at the former GWR Swindon Works on 19 May 1950. The Castle Class locomotives were built as express passenger locomotives on the GWR. The Castle Class locomotives were to replace the earlier 4000 Star class locomotives. They were designed by the railways Chief Mechanical Engineer, Charles Collett. Cadbury Castle cost 10. 546 and an extra 1. 094 for her Hawksworth tender.