 The system of grouping narrow-gauge locomotives into classes was only adopted by the SAR at some date between 1928 and 1930.At that point, these six locomotives and the three Class Hd locomotives were all designated Class NG5.The 1922-vintage Class NG5 was placed in service on the narrow-gauge line from Swakopmund on the Atlantic coast to Tsumeb and Grootfontein in South West Africa (SWA).