Commuter and suburban heavy rail systems in the United Kingdom
Urban and suburban rail plays a key role in public transport in many of the major cities of the United Kingdom. Urban rail refers to the train service between city centres and suburbs or nearby towns that acts as a main mode of transport for travellers on a daily basis. They consist of several railway lines connecting city centre stations of major cities to suburbs and surrounding towns.
Train services and ticketing are fully integrated with the national rail network and are not considered separate. In London, a route for Crossrail 2 has been safeguarded.