tenders rode on three-axle Buckeye bogies to reduce the axle load and, along with the Type MX, became commonly known as Torpedo tenders. The piston valves were actuated by Walschaerts valve gear and the standard SAR type steam reversing gear was arranged on the right-hand side. The engine and tender were both equipped with vacuum brakes and the engine's two diameter vacuum cylinders were arranged outside the engine's frame and under the running boards, one on either side. The valve gear, brake gear and coupled wheel hubs were soft grease lubricated, while the bronze axle boxes had hard grease lubrication. The leading and trailing bogies were fitted with roller bearing axle boxes while the tender's bogies used plain bearings. Service The Class 24 was built to replace the old Classes 6, 7 and 8 locomotives in branch line service on light rail. When they were introduced, an elaborate programme was drawn up to show on which systems and on what sections they were to be employed. The Cape Western System, on the Saldanha-Kalbaskraal, Porterville-Hermon and Prince Alfred Hamlet-Wolseley sections. The Cape Midland System, on the Knysna-George, Alexandra-Barkly Bridge, Kirkwood-Addo and Somerset East-Cookhouse sections. The Orange Free State System, on the Dover-Vredefort, Wolwehoek-Arlington-Marquard, Theunissen-Winburg, Westleigh-Orkney and Vierfontein-Bultfontein sections. The Eastern Transvaal System, on the Soekmekaar-Komatipoort, Barberton-Kaapmuiden, Middelburg-Stoffberg, Brits-Beestekraal and Zebediela-Naboomspruit sections. The South West Africa System, on the De Aar-Karasburg and Keetmanshoop-Windhoek sections. Most of them went to the South West Africa System, where 55 of them would be in operation. From some time between 1955 and 1959, they were also employed on the Keetmanshoop-Walvisbaai section. They remained in that territory until 1961, when strengthening of the track and the complete dieselisation of the South West Africa System made them available to be employed elsewhere. Other branch lines to be served by the Class 24 include Breyten to Lothair, Nylstroom to Vaalwater, Port Elizabeth to Alexandra and George to Knysna. As a relatively powerful locomotive, they were also useful as suburban locomotives, a role they served in on the Springs-Nigel commuter line until electrification. Some eventually also worked on the Selati line in the Transvaal Lowveld. Heavy overhauls were done at Bloemfontein. The only province where they were unknown was Natal. The Calvinia and Sakrivier branches had been worked almost exclusively by Class 19C locomotives from about 1950, but from 1951 two Class 24s were also allocated to Beaufort West and