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GWR 7800 Class
The Great Western Railway (GWR) 7800 Class or Manor Class is a class of 4-6-0 steam locomotive. They were designed as a lighter version of the GWR Grange Class, giving them a wider Route Availability. Like the 'Granges', the 'Manors' used parts from the GWR 4300 Class Moguls but just on the first batch of twenty. Twenty were built between 1938 and 1939, with British Railways adding a further 10 in 1950. They were named after Manors in the area covered by the Great Western Railway. Nine are preserved.
==Background==
Although successful mixed traffic designs, neither the Hall nor the Grange 4-6-0 classes were able to cover the full range of duties previously undertaken by the 4300 Class 2-6-0 locomotives due to their ‘red’ weight classification. By the late 1930s a lighter version of the Grange class was urgently required for those cross-country and branch line duties forbidden to heavier locomotives. 〔 〕 A new lighter (Swindon No.14) boiler was therefore designed, and as with the Grange Class, the driving wheels and motion components were recovered from withdrawn members of the 4300 Class. The Manor class, with an axle loading of just over 17 tons, could be utilised on many lines from which the heavier Granges were barred
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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