Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In 1914 the South African Railways (SAR), later renamed Spoornet and then Transnet Freight Rail (TFR), placed 10 Class 15 4-8-2 steam locomotives in service. The Class 15 was introduced by SAR chief mechanical engineer D.A. Hendrie as a large mixed traffic locomotive for use where grades and curvature were less severe than on the coastal sections. Ten locomotives were built by North British and delivered in 1914. They had plate frames, Walschaerts valve gear, Belpaire fireboxes without combustion chambers and were superheated. In order to reduce the weight on the trailing wheels, steel fireboxes were used. This last feature became standard on large locomotives, but necessitated the introduction of water treatment plants in some parts of the country to prevent corrosion.

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