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LNER Class V1/V3
The London and North Eastern Railway (LNER) Class V1 and Class V3 were two classes of related 2-6-2T steam locomotive designed by Sir Nigel Gresley.
A total of 82 V1s were built with 71 being rebuilt into the higher pressure V3s with an additional ten being built as V3s from the final batch of V1s. The V3 was a development of the V1 with increased boiler pressure and a resultant increase in tractive effort.
==Development history==
The development of large tank engines was somewhat delayed by problems on the Southern Railway following the Sevenoaks derailment thought to have been caused by the instability of the large K class 2-6-4 tanks. Gresley carried out stability tests on one of these locomotives and finding no trouble and without further delay produced his sophisticated VI class suburban tank in 1930. This incorporated his 3-cylinder system and was the first example of all three cylinders and valve chests being incorporated into a single steel casting;〔Brown, F.A.S: ''Nigel Gresley, Locomotive Engineer'' (Ian Allan, London, UK, 1961), pp.107-108〕 this arrangement was used for the P2 ''Cock o' the North'' and the subsequent V2, K4 and V4 types.
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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