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SR N15X class
The SR N15X class or ''Remembrance'' class were a design of British 4-6-0 steam locomotives converted in 1934 by Richard Maunsell of the Southern Railway from the large LB&SCR L class 4-6-4 tank locomotives that had become redundant on the London–Brighton line following electrification.〔Holcroft,"Locomotive Panorama vol 1"''〕 It was hoped that further service could be obtained from these locomotives on the Southern's Western Section, sharing the duties of the N15 class locomotives.〔Clarke: ''Steam World'' (April 2008), p. 49〕 The locomotives were named after famous Victorian engineers except for ''Remembrance'', which was the LBSCR's memorial locomotive for staff members who died in the First World War.
In their new form the locomotives were similar in outline to the N15 class, though suffered from the expectation amongst crews that they were an improved version of this type. Despite this, their ability to accelerate well was put to good use on cross-country trains between main lines.〔 The class saw service into nationalisation in 1948.〔Burridge, p. 46〕 All had been withdrawn by 1957, with none preserved.〔
== Background ==
With the impending electrification of the Southern Railway's Central Section (the former LB&SCR lines), the question arose as to what to do with the relatively new and powerful LB&SCR designs.〔 Maunsell looked at the possibility of converting the LBSCR “Remembrance” or LB&SCR L Class 4-6-4 tanks built by L. B. Billinton between 1914 and 1922. These Baltics had proved to be capable machines on the Brighton line, although their relatively low boiler pressure (), the excessive difference between "first valve" and "second valve" on the regulator, and more particularly their small () piston valves in relation to their large () cylinders were a significant limitation, precluding their use on any other part of the Southern system.〔Bradley, "L class"〕 The decision was taken to rebuild them into more conventional 4-6-0 tender locomotives.
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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