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LB&SCR B4 class
The B4 class were 4-4-0 steam locomotives for express passenger work on the London, Brighton and South Coast Railway. They were designed by R. J. Billinton and were either built at Brighton works 1899–1902 or else by Messrs Sharp, Stewart and Company in 1901. Twelve members of the class were rebuilt from 1922–1924 by L. B. Billinton with a larger boiler, cylinders and a superheater. The rebuilt locomotives were classified B4X.
==Construction==
The performance of Robert Billinton’s B2 class 4-4-0 locomotives of 1895–1897 had proved to be disappointing and they had not been able to replace the earlier Stroudley’s B1 class 0-4-2 on the heaviest London to Brighton express trains. Billinton therefore sought authority for the construction of twenty-five larger and more powerful 4-4-0 B4 class locomotives. The first two of these, Nos. 52 and 53, were completed at Brighton works between December 1899 and January 1900, both of which performed well and demonstrated that the new design was sound. However during the spring of 1900 a backlog of repair work at Brighton meant that the third (No. 54) was not completed until May 1900. The railway therefore approached Sharp, Stewart and Company to supply twenty-five further examples over the next twelve months. These were all delivered between June and October 1901. By 1901 Brighton had overcome the backlog of repair work and five further locomotive boilers were ordered from Sharp, Stewart and Company to be used on additional locomotives to be built at Brighton between June and September 1902.
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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