South Australian Railways

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.

Source: Wikipedia — South Australian Railways (CC BY-SA 4.0)