Beira Railway's retired narrow gauge Falcon F2 and F4 locomotives were acquired from Mozambique by the Union Defence Forces for use in South Africa, where they replaced locomotives that had been commandeered for the war effort in German South West Africa during World War I. At the end of the war, these locomotives were staged until they were placed back in service by the South African Railways (SAR) in 1921. When a system of grouping narrow gauge locomotives into classes was eventually introduced by the SAR between 1928 and 1930, they were classified as Class NG6. In 1936, Bagnall built a single 4-4-0 tank locomotive, named Burnside and with cylinders, for the gauge line of the Natal Estates sugar plantation at Mount Edgecombe in Natal. Standard gauge The third locomotive of the Natal Railway Company was delivered in January 1876, sixteen years after the opening of the railway. It was a 4-4-0 side tank engine, built by Kitson & Company and named Perseverance. This was the last standard gauge locomotive to be obtained by the Natal Railway Company before the establishment of the Natal Government Railways in 1877 and the conversion from Standard gauge to . Cape gauge Seven side-tank locomotives were built for the Cape Government Railways (CGR) by Robert Stephenson & Company in 1875. Since they were found to be fast and reliable engines, four more were delivered in 1880, built by Neilson & Company and practically identical to the previous seven, but equipped with small optional four-wheeled water tenders. They were all designated 1st Class when a locomotive classification system was introduced by the CGR. In 1879, the Cape Government Railways placed four 1st Class tender locomotives in service, built by the Avonside Engine Company. They were intended for fast passenger service on the Cape Western and Eastern systems and were followed by eleven more from Neilson & Company in 1880. In 1881, the CGR placed six more 1st Class tank-and-tender locomotives in service on its Cape Midland system. These were built by Neilson & Company as tender locomotives without on-board coal bunkers and with permanently attached coal and water tenders. Two of them became SAR Class 01 in 1912. Between 1882 and 1891, eleven tank locomotives for the Wynberg suburban line in Cape Town were delivered to the CGR from Neilson and Dübs & Company. Designated 2nd Class and known as Wynberg Tanks, ten of them