CityRail is an operating brand of RailCorp, a state-owned corporation of the Government of New South Wales, Australia.

CityRail is responsible for providing commuter rail services, and some coach services, in and around Sydney, Newcastle and Wollongong, the three largest cities of New South Wales. The majority of the CityRail system is electrified with 1500 V DC supplied by overhead wire and are operated by double-deck multiple units. Some isolated sections outside the Sydney metropolitan area are operated by single-deck diesel railcars. The network is incorporated in the New South Wales MyZone ticketing system.

Construction of the rail network began 3 July 1850. Today it consists of 307 stations and over 2,060 km (1,280 mi) of track, extending to the upper Hunter Valley, south to the Shoalhaven area and reaching as far west as Lithgow. An average of 1 million trips are made from these metropolitan, intercity and regional stations each day.

CityRail was established pursuant to the Transport Administration Act, 1988 (NSW) and works with its sister group, CountryLink, which operates rail and coach services in regional New South Wales.

Read more about CityRail:  Network, History, Challenges, Future Development, Timeline of Major Changes To CityRail Since 2000