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SR L1 class
The Southern Railway L1 class was a class of 4-4-0 steam tender locomotives built for express passenger service on the South Eastern Main Line of the Southern Railway (Great Britain). They were designed by Richard Maunsell as a development of Harry Wainwright's L class.
==Background==
Harry Wainwright had built two useful and attractive 4-4-0 classes for the South Eastern and Chatham Railway between 1902 and 1908; the D class and the E class, and had completed designs for a larger L class at the time of his retirement at the end of 1913. However, by 1918 they were beginning to struggle with the heaviest express trains. Wainwright's successor, Richard Maunsell, therefore rebuilt several examples of the D and E classes immediately before the grouping of the SECR with other railways to form the Southern Railway in 1923.
When Maunsell was appointed as Chief Mechanical Engineer of the new railway he turned his attention to designing new K & K1 class 2-6-4 tank engines. However, in 1926 there was an urgent requirement for fifteen more powerful 4-4-0 locomotives for the London to Folkestone express trains. Maunsell did not rebuild the L class as the locomotives were still relatively new and useful in their present form. He rather amended Wainwright's drawings to form his own L1 class, and supplied them to the North British Locomotive Company. The weight of the new class was increased to 57 tons 16 cwt. The boiler pressure was increased from 160 to 180 lbs per square inch but the cylinders reduced in diameter from . The engines also had long-travel piston valves, Maunsell’s own design of superheater and side-window cab and other detail alterations.
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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