June
14 – The National Party under James Barry Munnik Hertzog wins the South African general election with an outright majority for a second consecutive term.
August
26 – Union Airways Company is launched and becomes South Africa's first official commercial airline service.
Arthur Goldreich, South African-Israeli abstract painter and key figure in the anti-apartheid movement, is born in Johannesburg. (d. 2011)
3 April – Cape – Hermon to Porterville, 36 miles 10 chains (58.1 kilometres).
10 April – Cape – Ceres to Prince Alfred Hamlet, 6 miles 25 chains (10.2 kilometres).
16 April – Free State – Wesselsbron to Bultfontein, 35 miles 45 chains (57.2 kilometres).
31 July – Free State – Arlington to Lindley, 12 miles 26 chains (19.8 kilometres).
12 August – Transvaal – Boshoek to Middelwit, 58 miles 35 chains (94.0 kilometres).
31 August – Transvaal – Messina to Beitbridge, 10 miles 30 chains (16.7 kilometres).
14 November – Transvaal – Derwent to Stoffberg, 37 miles 73 chains (61.0 kilometres).
1 December – South West Africa – Seeis to Witvlei, 66 miles 41 chains (107.0 kilometres).
Six new steam locomotive types, four Cape gauge and one narrow gauge, enter service on the South African Railways (SAR):
Fourteen purpose-built Class S 0-8-0 shunting steam locomotives.
Thirty-six Class 19A 4-8-2 Mountain type steam locomotives.
Five Class GDA 2-6-2+2-6-2 Double Prairie type Garratt articulated branchline locomotives.
The first two of eight Class GL 4-8-2+2-8-4 Double Mountain type Garratt locomotives on the Durban-Cato Ridge section in Natal.
A single self-contained steam Clayton Railmotor for low-volume passenger service.
A single narrow gauge 0-6-0 tank locomotive, built to the same design as the DSWA Class Hc of 1907, on the Otavi Railway in South West Africa.
