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The South African Railways Class 19D 4-8-2 of 1937 is a steam locomotive. Between 1937 and 1949 the South African Railways placed two hundred and thirty-five Class 19D steam locomotives with a 4-8-2 Mountain type wheel arrangement in service. Between 1951 and 1953 thirty-three more were built for other operators like the Rhodesian and Angolan railways and the Nkana and Wankie mines.〔 ==Manufacturers== The Class 19D 4-8-2 steam locomotive was the final development of the Class 19 series of locomotives. At the request of Colonel F.R. Collins, Chief Mechanical Engineer (CME) of the South African Railways (SAR) from 1922 to 1929, the original basic design of the Class 19 was done in the late 1920s by Test Engineer M.M. Loubser, himself later to serve as the CME from 1939 to 1949. The final development was done in 1937 by W.A.J. Day, CME from 1936 to 1939. The Class 19D was built in batches by several locomotive manufacturers in Germany, Czechoslovakia and the United Kingdom.〔〔Information supplied by R.S. Loubser, son of M.M. Loubser〕 * The first forty were built in Germany in 1937, twenty with domeless boilers by Friedrich Krupp AG in Essen, numbered in the range from 2506 to 2525, and twenty by the Borsig Lokomotiv Werke in Hennigsdorf, Berlin, numbered in the range from 2526 to 2545.〔Friedrich Krupp AG, Essen Listen-Verwaltung: Stw – works list as supplied by Piotr Staszewski〕 * In 1938 a further ninety-five locomotives were ordered, built by three manufacturers. Škoda Works in Czechoslovakia built fifteen, numbered in the range from 2626 to 2640, Krupp built forty, with domed boilers this time and numbered in the range from 2641 to 2680, and Borsig built forty, numbered in the range from 2681 to 2720.〔〔Škoda-Werke, Plzen (Pilsen), Czechoslovakia works list, as supplied by Piotr Staszewski〕 * Locomotive building was interrupted by World War II and post-war locomotive procurement saw German suppliers being replaced by British ones. In 1947 the first fifty post-war Class 19D locomotives were delivered by Robert Stephenson and Hawthorns (RSH) of Darlington, England, numbered in the range from 2721 to 2770.〔 Of this order engine no. 2734, RSH works no. 2747, was lost at sea off the east coast of England. Its replacement, with RSH works number 7360, was paid for by insurance and it received the number 2734 of the lost locomotive. * The final batch of fifty Class 19D locomotives for the SAR were delivered in 1949 by the North British Locomotive Company (NBL) of Glasgow, Scotland, numbered in the range from 3321 to 3370.〔North British Locomotive Company works list, compiled by Austrian locomotive historian Bernhard Schmeiser〕〔South African Railways and Harbours Locomotive Diagram Book, 2’0” & 3’6” Gauge Steam Locomotives, 15 August 1941, as amended〕 * Between 1951 and 1953 Henschel and Son built twenty-one more for the Rhodesia Railways (RR), and altogether twelve more were built for the Caminho de Ferro de Benguela (CFB) in Angola and for industry by Henschel and NBL.〔〔Henschel & Son works list, compiled by Dietmar Stresow〕 The Class 19D, nicknamed "Dolly", was very similar to its predecessor Class 19C, but W.A.J. Day specified piston valves and Walschaerts valve gear instead of RC Poppet valve gear. The cylinders were redesigned with straighter steam ports, while the valve gear itself was revamped with a longer steam lap and greater travel. In all other respects they were identical to the Class 19C.〔〔(Naboomspruit Municipal Offices, SAR Class 19D No. 2534 )〕〔 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「South African Class 19D 4-8-2」の詳細全文を読む スポンサード リンク
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