GWR 4073 Class
A Castle class locomotive was a particular type of steam locomotive of the Great Western Railway. Some were produced as rebuilds of Star class locomotives. The original designer was C. B. Collett.
The first to be built, in August 1923, was number 4073 Caerphilly Castle; the last, in August 1950, was number 7037 Swindon.
A few survive in preservation as either working examples or static exhibits, including Caerphilly Castle, Clun Castle, Pendennis Castle, Nunney Castle, and Defiant.
In 1926, number 5000 Launceston Castle was loaned to London Midland Scottish Railway where it ran trials between London to Carlisle.
Withdrawal started in the 1950s; the last to be withdrawn was Clun Castle.
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