page_title: 4-6-0
section_title: Narrow gauge
hierarchical_section_title: 4-6-0 / Usage / South Africa / Narrow gauge
caption_attribution_description: Cape Government Railways "Type B" (No. NG 33–38, later SAR No. NG 27–32). Used on the Avontuur Railway.
context_page_description: Under the Whyte notation for the classification of steam locomotives by wheel arrangement, 4-6-0 represents the configuration of four leading wheels on two axles in a leading bogie and six powered and coupled driving wheels on three axles with the absence of trailing wheels. In the mid 19th century, this wheel arrangement became the second most popular configuration for new steam locomotives in the United States of America, where this type is commonly referred to as a Ten-wheeler. As a locomotive pulling trains of lightweight all wood passenger cars in the 1890-1920s, it was exceptionally stable at near 100 mph speeds on the New York Central's New York to Chicago Water Level Route and on the Reading Railroad's Camden to Atlantic City, NJ, line. As passenger equipment grew heavier with all steel construction, heavier locomotives replaced the Ten Wheeler.
context_section_description: In 1903, the CGR placed six Type B 4-6-0 locomotives with eight-wheeled bogie tenders in service on the Avontuur narrow gauge line in the Langkloof. They were built by W. G. Bagnall and had bar frames, copper fireboxes and Stephenson valve gear. In 1912, they came into SAR stock and, in 1914, a further three locomotives with slightly longer boilers were acquired by the SAR. One of these was also built by Bagnall while the other two were built by Kerr, Stuart and Company. These three were commonly referred to as the Improved B. When a system of grouping narrow gauge locomotives into classes was eventually introduced somewhere between 1928 and 1930, they were to be classified as Class NG8 but had already been withdrawn from service.
  During 1915 and 1916, the SAR placed six locomotives in service in the Langkloof, built by Baldwin Locomotive Works. They were very similar to the Bagnall built Type B, except that they were equipped with Walschaerts valve gear. They were later designated Class NG9. Three of them survived in SAR service until April 1951, when they were sold to the Caminhos de Ferro de Moçâmedes (CFM) of Angola. (Also see Angola - Narrow gauge)
caption: SAR Class NG8
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