[1] The first 15 locos were swapped between the narrow and standard gauge networks by changing the bogies and couplers.

However, by the mid-1960s, problems were experienced in working wide standard gauge rolling stock such as the Treadwell hot metal cars.

The next 2 locos were delivered in 1977 (55 and 56) and were fitted with Cummins NT855 turbocharged engines, the latter built to narrow gauge specifications.

Later many of these were repowered with Cummins NT855 turbocharged engines, those locos which weren't re-engined were either scrapped or sold.

[3] Privately owned The General Electric 80 Ton switcher locomotive design was used by other industrial manufacturing companies around New South Wales including Sulphide Corporation who purchased one in November 1964 for its Cockle Creek Smelter, Southern Portland Cement who purchased two in July 1967 for use at Marulan South and Berrima, and John Lysaght who purchased one for use at Port Kembla.