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GWR 3200 Class
The Great Western Railway 3200 Class (or 'Earl' Class) was a design of 4-4-0 steam locomotive for passenger train work. The nickname for this class was Dukedog since the locomotives were composed of former Duke Class boilers on Bulldog Class frames. As such they were one of the last steam locomotive classes to retain ''outside frames''.
==Background==
The GWR absorbed the Cambrian Railways in 1923, but with the Cambrian main line being lightly built, permanent way restrictions debarred the use of heavier locomotives, meaning that only a few classes of GWR locomotive were allowed to run over it. The result was the extension of the life of the Duke class locomotives, which had been built from 1895 at Swindon Works for express work in Cornwall. However, by the 1930s many of the Duke class were becoming uneconomical to repair, particularly with regard to the curved outside frames, which were weaker than the later straight-topped version.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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