English: South Australian Railways dual-gauge centraliser, Gladstone, South Australia. A fixed point centraliser to bring narrow gauge vehicles into a concentric position in broad gauge track: used to line up the end doors in sheep cars for transfer and to get the right clearance at the loading ramp seen in the background.

In 1970, the line from Port Pirie to Broken Hill was opened after several years' engineering work to convert it to standard gauge, resulting in all three mainline gauges used in Australia – 1435 mm standard gauge, 1600 mm broad gauge, and 1067 mm narrow gauge – meeting in the railway yards at Gladstone . In the late 1980s, the broad and narrow gauge lines were closed, leaving Gladstone as standard gauge only.