Hornby R2850 Owing much to the GWR Star the Collett designed Castle Class locomotives first started to leave the Swindon Works in 1924. "Caerphilly Castle", the first of the Class first appeared at the Empire Exhibition in the same year. These powerful 4-6-0 locomotives were renowned for hauling heavy trains at high speeds and remained on top link express duties until they were replaced by diesels in the early 1960s. On June 8, 1932 No. 5000 covered the 77 miles from Swindon to London in 56 minutes with 39 miles of the run being made at 90 mph which was quite an achievement at the time. So successful was the design of these locomotives that they continued to be built until 1950.