The New Cape Central Railway places two 2-6-2+2-6-2 Double Prairie type Garratt articulated steam locomotives in service. They will be designated Class GK on the South African Railways (SAR) in 1925.
Major Frank Dutton, SAR Signal Engineer and the Motor Transport Superintendent, conducts trials with a prototype petrol-paraffin powered Dutton road-rail tractor.
Mr. C. Lawson, Superintendent Mechanical of the SAR, experiments with gas-electric motive power and constructs a single experimental producer gas-electric locomotive. The locomotive remains in service for several years but the gas-electric concept will eventually be superseded by diesel-electric traction.
^ abcPaxton, Leith; Bourne, David (1985). Locomotives of the South African Railways (1st ed.). Cape Town: Struik. pp. 93–94, 118–119. ISBN0869772112.
^ abEspitalier, T.J.; Day, W.A.J. (1945). The Locomotive in South Africa - A Brief History of Railway Development. Chapter VII - South African Railways (Continued). South African Railways and Harbours Magazine, October 1945. pp. 782-783.
^Heymans, Brig. H.B.; Parsley, Dr. G.M.J. (2000).The SAR Experimental Suction Gas-Electric Locomotive. Paper dated 28 September 2000.