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Under the Whyte notation for the classification of steam locomotives by wheel arrangement, represents the arrangement of four leading wheels on two axles, usually in a leading bogie, ten powered and coupled driving wheels on five axles, and two trailing wheels on one axle, usually in a trailing truck. In South Africa, where the wheel arrangement was first used, the type was known as a Reid Tenwheeler. In the United States of America (USA) it was known as a Southern Pacific on the Southern Pacific Railroad and as an Overland on the Union Pacific Railroad. Other equivalent classifications are: * UIC classification: 2'E1' (also known as German and Italian classifications) * French classification: 251 * Turkish classification: 58 * Swiss classification: 5/8 ==Overview== This wheel arrangement was first used on the Natal Government Railways (NGR) in South Africa in 1899, on a 4-10-2T tank locomotive that was designed to meet the requirement for a locomotive that could haul at least one and a half times as much as an NGR Dübs A 4-8-2T locomotive.〔 In the USA a simple expansion (simplex) version of the type was used only on the Southern Pacific and Union Pacific Railroads. Baldwin Locomotive Works built an experimental compound expansion in 1926, but since the weight and length of this engine was too much for all but the heaviest and straightest track and compound steam locomotives had already lost favor on US railroads, its demonstration runs failed to generate interest and no more were produced.〔Swengel, F.M. (1967). ''The American Steam Locomotive: Vol. 1, The Evolution of the Steam Locomotive''. Davenport: Midwest Rail Publications. pp. 222-223.〕〔(【引用サイトリンク】url=http://www.aqpl43.dsl.pipex.com/MUSEUM/LOCOLOCO/USAhp/USAhp.htm )〕 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「4-10-2」の詳細全文を読む スポンサード リンク
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