South Australian Railways
| Industry | Railway owner, operator and manufacturer |
|---|---|
| Founded | 1854 |
| Defunct | 28 February 1978 |
| Fate | Sold to the Australian federal government |
| Successor | Australian National Railways Commission, trading as Australian National |
| Headquarters | , |
Area served | South Australia |
| Parent | Government of South Australia |
South Australian Railways (SAR) was the organisation through which the Government of South Australia built and operated railways in South Australia from 1854 until March 1978, when its non-urban railways were incorporated into Australian National, and its Adelaide urban lines were transferred to the State Transport Authority.
The SAR's tracks were built to three rail gauges: 1600 mm (5 ft 3 in) broad gauge; 1067 mm (3 ft 6 in) narrow gauge; and from the 1980s, when gauge standardisation at last commenced, 1435 mm (4 ft 8+1⁄2 in) standard gauge.