Sydney Trains is a train operator of a commuter-based rail network centred on the metropolitan area of Sydney which comprises seven metropolitan lines. The entire length of railway in New South Wales is maintained by Transport for New South Wales which is a statutory authority of the Government of New South Wales. It was formed when CityRail was dissolved on 30 June 2013. The former CityRail network has over 2,060 km of track. The Sydney Trains network extends up to Berowra, to the north, Emu Plains to the west, Waterfall to the south, and Macarthur to the south west.
Most of the Sydney Trains network runs on the surface of suburban areas while some recently constructed and inner city sections will run underground. The network is served by a fleet of double-deck electric multiple units.