National Rail (NR) is the trading name licensed for use by the Rail Delivery Group, an unincorporated association whose membership consists of the passenger train operating companies (TOCs) of England, Scotland, and Wales. The TOCs run the passenger services previously provided by the British Railways Board, from 1965 using the brand name British Rail. Northern Ireland, which is bordered by the Republic of Ireland, has a different system. National Rail services share a ticketing structure and inter-availability that generally do not extend to services which were not part of British Rail.
The London station group is a group of 18 railway stations served by the National Rail network in central London. The group contains all 14 terminal stations in central London, either serving major national services or local commuter routes, and 4 other through-stations that are considered terminals for ticketing purposes. All current stations in the group fall within London fare zone 1. A ticket marked "London Terminals" allows travel to any station in the group via any permitted route, as determined by the National Routeing Guide.