end of the 19th century 0-6-0 tender engines were used on goods, and 4-4-0 configurations for passenger workings. The majority of locomotives were imported from Britain, from companies such as Beyer, Peacock & Company, Robert Stephenson & Company, R & W Hawthorn and George England and Co. The Williamstown Workshops also built locomotives locally, as did the Phoenix Foundry in Ballarat. As the size of trains increased, so did the locomotives. The 4-6-0 wheel arrangement became popular for passenger and mixed traffic work with the D3 and A2 classes, and the 2-8-0 arrangement on goods with the K, J and C classes lasting into the 1960s. These were then followed by the 4-6-2 S class Pacifics for the Spirit of Progress express, and the single 4-8-4 H class locomotive H220, the biggest Victorian Railways steam locomotive. The final steam locomotives built for the Victorian Railways were the 4-6-4 R class and 2-8-0 J classes. Although they were of more modern design, their advantages were overshadowed by the simultaneous arrival of the first diesels. Electric locomotives were first acquired with the electrification of the suburban railways, the E class suburban engines acquired in 1923 and 1928–29, followed by the L class from 1953 when the mainline to Traralgon was electrified for briquette traffic. Dieselisation occurred from 1951 with the F class shunter, but the B and S classes of 1952 and 1957 revolutionised main line operations. They were then followed by the T and Y classes in 1955 and 1963 which displaced steam from the branch lines and yards. Apart from the F class, Clyde Engineering has had a monopoly on Victorian diesel-electric locos. as the Australian licensee of General Motors EMD engines and traction motors, fitting them into locally designed bodies. By the 1980s the first generation locomotives were approaching the end of their lives, with the electric locomotives withdrawn by 1988, and the modern N and G classes allowing the withdrawal of lower power T and Y classes. Today, the former Victorian Railways locomotive fleet has been split into two, with the N class utilised by V/Line on passenger services, with the remainder with Pacific National or other private operators in freight use. No new passenger locomotives have been built since the 1980s, with Diesel Multiple Units being acquired instead. Freight operations have seen the re-powering of the G and X classes, as well as the restoration to service