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GWR 4900 Class
The Great Western Railway (GWR) 4900 Class or Hall Class is a class of 4-6-0 mixed traffic steam locomotives designed by Charles Collett. A total of 259 were built, numbered 4900–4999, 5900–5999 and 6900–6958. The LMS Stanier Class 5 4-6-0 and LNER Thompson Class B1 both drew heavily on design features of the Hall Class. After nationalisation in 1948, British Railways gave them the power classification 5MT.
== Background ==
By the end of 1923 the GWR was well served with express passenger locomotives of the Saint and Star classes and had recently introduced the Castle Class. However the mixed traffic 2-6-0 locomotives of the 4300 Class were beginning to struggle with the increasing loads. George Jackson Churchward had recognised this with the introduction of the 4700 class 2-8-0 with driving wheels, intended for express goods and relief passenger trains. However, Collett preferred the idea of a Saint Class with smaller wheels to undertake these duties as this would provide a leading bogie. He therefore rebuilt number 2925 ''Saint Martin'' with driving wheels.
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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