The Australian Railways Union formed in September 1920 with the amalgamation of the Queensland Railways Union, the New South Wales Amalgamated Railway and Tramway Service Association, the Victorian Railway Union, the Railway and Tramway Employees Association of South Australia and the Tasmanian Railway Union. It was the first Australian all-grades organisation of railway workers and was federally registered on 8 February 1921. In 1993 the ARU merged with other unions to form the Rail Tram & Bus Industry Union.