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The Rhodesia Railways 20th class, later Zambia Railways and National Railways of Zimbabwe 20th classes, were among the largest and most powerful steam locomotives in the southern hemisphere. With 61 locomotives built, they were the fourth largest class of Garratt locomotive built – after the South African Railways class GMA, (120), the Rhodesia Railways 15th class, (74) and the South African Railways class GF (65). ==Design== The locomotives have a 4-8-2+2-8-4 of "Double Mountain" wheel arrangement. This arrangement was also used by most other large Garratts. The 20th class was the first and only class of Rhodesia Railways locomotives to be fitted with mechanical stokers. Other technical features included bar frames and thermic syphons. The later locomotives were classified as 20A class; the main difference being that the 20ths' inside and outside trailing wheels were of the same size, on the 20A, the inside trailing wheels diameter had been increased in size. The 20As were also heavier. The 20th class also had the round-ended bunkers characteristic of late Garratts. 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「Rhodesia Railways 20th class」の詳細全文を読む スポンサード リンク
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