page_title: 2-6-0+0-6-2
section_title: Cape gauge
hierarchical_section_title: 2-6-0+0-6-2 / Usage / South Africa / Cape gauge
caption_attribution_description: English: SAR Class GA 2140 (2-6-0+0-6-2), renumbered from 1649
context_page_description: Under the Whyte notation for the classification of steam locomotives, 2-6-0+0-6-2 represents the wheel arrangement of an articulated locomotive with two separate swivelling engine units, arranged back to back with the boiler and cab suspended between them. Each engine unit has two leading wheels in a leading truck, six powered and coupled driving wheels on three axles and no trailing wheels.
  The arrangement is effectively two 2-6-0 locomotives operating back-to-back and was used on Garratt articulated locomotives. Since the 2-6-0 type was often known as a Mogul, the corresponding Garratt type was usually known as a Double Mogul.
  A similar wheel arrangement exists for Mallet steam locomotives on which only the front engine unit swivels, but these are referred to as 2-6-6-2.
context_section_description: In February 1921, the SAR placed a single experimental Class GA Garratt 2-6-0+0-6-2 locomotive in service. It was ordered from BP in 1914, together with the order for the narrow gauge Class NG G11 Garratts, but wartime hostilities also delayed its delivery until 1920. It was the first Cape gauge Garratt to enter service in South Africa.
  The locomotive was superheated, with a Belpaire firebox, a plate frame and Walschaerts valve gear. It was erected in the Durban shops and placed in trial service on the Natal mainline. During the trials it was found that the absence of trailing carrying wheels on the engine units was a disadvantage, since it led to excessive flange wear on the driving wheels. As a result, the locomotive remained the only representative of its Class and all subsequent Garratt models of the SAR were equipped with trailing Bissel trucks on their engine units. The locomotive was withdrawn from service in 1938 because of a cracked frame and scrapped.
caption: SAR Class GA, circa 1921
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