This is a list of the railway passenger stations in the first six fare zones across London, England, in the national network where London area ticketing applies. United Kingdom railway stations are grouped into one of a number of categories, ranging from A—national hub to F—small unstaffed bare platform. Many of the principal central London stations are managed by Network Rail and together form a London station group. Most other stations are managed by the train operating company that provides the majority of services at the station. London Underground is the manager of some stations that are also served by other heavy rail services.