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GWR/BR (WR) Castle Class Manual: A guide to the history and operation of one of Britain's most successful express passenger steam locomotive types
GWR/BR Castle Class Manual A guide to the history and operation of one of Britain's most successful express passenger steam locomotive types - WR Author:Drew Fermor The Great Western Railway 4073 Class, or Castle Class locomotives were the pride of the GWR when introduced in the mid-1920s, and were heralded as Britain's most-powerful express passenger locomotives. 171 Castles were built or converted between 1923 and 1950, and eight preserved examples survive today.