The Transwa WDA/WDB/WDC and WEA/WEB classes are two classes of railcars built by United Goninan, Broadmeadow for Transwa in 2004–2005 to replace the WAGR WCA/WCE class railcars on the AvonLink, MerredinLink and Prospector services in Western Australia.

UGL Rail is an Australian rail company specialising in building, maintaining and refurbishing diesel locomotives, diesel and electric multiple units and freight wagons. It is a subsidiary of UGL and is based in Melbourne, with a staff of 1,200 across Australia and Asia. It operates factories in Broadmeadow, Maintrain Auburn, Spotswood and Bassendean. While it used to operate a factory in Taree, the plant was shut down and the equipment sold off.