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The GWR 1400 Class is a class of steam locomotive designed by the Great Western Railway for branch line passenger work. It was originally classified as the 4800 Class when introduced in 1932, and renumbered in 1946. Although credited to Collett, the design dated back to 1868 with the introduction of the George Armstrong 517 class. ==Precursors== Like the 48xx/14xx, the 517 Class was a lightweight loco for branchline work; it was built at Wolverhampton Works between 1868 and 1885. In this period evolutionary changes included: * 517-570 – with wheelbase, inside bearings to trailing wheels, and saddle tanks built 1868-1869. * 571-576 – with wheelbase, outside bearings and side tanks built 1869-1870 * 826-836, 838-849, 1154–1165, 202-05, 215-222, 1421–1432, 1433–1444, 1465-1482 – all with wheelbase with side tanks built 1873-1883 * 1483-1488 – with wheelbase and side tanks built 1884-1885 Later gradual changes included: Belpaire fireboxes, boilers rated at as opposed to , full cabs, extended bunkers and the progressive conversion of short wheelbase locos to or . From 1924 onwards, several were converted to run with an autocoach, and in this configuration were the direct ancestors of the 48xx class. In this form, the updated 517's were but a small step away from the 48xx. The wheelbase was still , the boiler still rated at only , and the wheels and . New was the Collett-style cab and bunker and the boiler nominally to a new design. A three bar crosshead was added to the motion. This was a 1924 innovation introduced with the GWR 5600 Class and also seen in the 1930s-built 5400, 6400 and 7400 classes of pannier tanks. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「GWR 1400 Class」の詳細全文を読む スポンサード リンク
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