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South African Class 21 2-10-4 : ウィキペディア英語版 | South African Class 21 2-10-4
The South African Railways Class 21 2-10-4 of 1937 is a steam locomotive. In 1937 the South African Railways placed a single Class 21 steam locomotive with a Texas type wheel arrangement in service, designed as a mixed traffic locomotive suitable for use on light rail. A simultaneously proposed heavier mainline version Class 22 never materialised.〔South African Railways and Harbours Locomotive Diagram Book, 2’0” & 3’6” Gauge Steam Locomotives, 15 August 1941, as amended〕〔 ==Manufacturer== The Class 21 2-10-4 Texas type locomotive was designed by A.G. Watson, Chief Mechanical Engineer (CME) of the South African Railways (SAR) from 1929 to 1936. It was built by the North British Locomotive Company (NBL) in Glasgow and delivered in 1937. Only the one locomotive was built, numbered 2551. At the time the design represented the maximum power obtainable from a ten-coupled non-articulated locomotive that was limited to a axle load on rail.〔〔〔North British Locomotive Company works list, compiled by Austrian locomotive historian Bernhard Schmeiser〕
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