Onslow railway

The Onslow railway, owned by WEZCO and operated by it's Australian subsidiary WEZCO Pilbara Ore, is a private rail network in the Pilbara region of Western Australia for the purpose of carrying iron ore.

Rolling stock
To operate construction trains, WEZCO purchased a withdrawn shunter. It was overhauled at and shipped from the  to  in May 1968. To haul the iron ore trains, five engines were purchased (100-105), two being built in  and three by  in. All had been retired by 1987 with one preserved on a plinth at Hedland Yard.

From March 1970-December 1972, 36 locomotives were built by  and then  in. By 1992, all had been withdrawn. Six were sold to the and exported to, serving the iron ore-hauling railway in northeastern  for several years.

In 1971, to shunt trains, six engines built by  in,  were delivered. They were withdrawn by 1994.

In 1979, nine engines built by,  were delivered. In 1997 they were withdrawn and sold to and exported to the United States. In 2005, TNR bought five of the C36-7s, while another was sold to Tennessee Pass Central, two were sold to New England Western Railroad, another was sold to MARTA Commuter Rail and another was repatriated to Australia.

In 1982, 10 locomotives built by,  arrived in two shipments from. The F40PH engines were used on local passenger routes and to transport mining crews to different locations. The F40PH's hauled former  that were converted to standard gauge by,. Five with withdrawn in 1996 and in August 1997 were sold to and exported to the United States. After being leased to, three were sold to Ferrocarriles de Puerto Rico, and the remaining two were briefly leased to the before being sold to WNY Runner in 2006. The remaining five still with WEZCO continue operating to this day.

In 1983, six engines were built by,. They were withdrawn in 2001 and were sold to and exported to the United States. One was later sold to New England Western Railroad and the rest later ended up on Ferroguate.

In 1989, six engines built in,  by  were delivered, joining the F40PH's on commuter and employee transport duties.

In 1991, six engines built by,  were delivered. In 2008, they were withdrawn and sold to and exported to the United States. In 2011, CSX traded in three deadline C36-7s for the ex-WEZCO C40-8s, and the C40-8s subsequently served with CSX until August 2016, when they were retired. Four were sold to the Tseng National Railway, one was sold to SFG Railway Operations, and another was repatriated to Australia. The one ex-WEZCO unit sold to SFG is, along with a few ex-CSX C40-8s, currently on lease to the.

In 1993, six former  locomotives were purchased and were rebuilt by  at  into F40PHL-2A locomotives. These supplemented the F40PH and F59PH engines on the commuter trains and employee transport trains.

In 1996, 17 engines were delivered in one shipment from Erie, Pennsylvania.