It is the day everything changes on Sydney's train system - or, depending on how you look at things, the day very little changes.

RailCorp is disbanded. In its place are two new organisations, with some new executives, new uniforms, and according to the minister, new approaches to moving people about and telling people how they are doing it.

All change: Newly appointed head of Sydney Trains Howard Collins with State Transport Mnister Gladys Berejiklian. Credit:James Alcock

''It's really two years of work that has got us to this point and we still have a lot to do,'' Transport Minister Gladys Berejiklian said of the operating companies, Sydney Trains and NSW Trains that, from July 1, take the place of RailCorp and its brand CityRail.

Sydney Trains will run most trains that move through Sydney and its suburbs. NSW Trains will run Countrylink and outer services to the central coast, Blue Mountains and Illawarra.