London railway station
The London station group is a ring of 18 railway stations served by the National Rail network in central London. Most are terminal stations, although a few are through-stations (that includes those with a combination of terminal and through platforms). Each of these stations is part of a notional "common location" to which tickets from stations outside that group are issued. The station group is rendered on tickets as London Terminals.
All current stations in the group fall within London fare zone 1. The large number of terminal stations is explained by the refusal of Parliament to allow railway lines to enter the centre of London in the 19th century, causing them to form a ring, connected by underground railways. The majority of the larger stations managed by Network Rail are in the group.
As of 2017, the group comprises:
...
Wikipedia