Within London, all London Underground, National Rail, London Overground, TfL Rail and Docklands Light Railway stations are assigned to six fare zones. Fare zone 1 covers the central area and fare zones 2, 3, 4, 5 and 6 form concentric rings around it.
Fare zone 4 is an outer zone of Transport for London's zonal fare system used for calculating the price of tickets for travel on the London Underground, London Overground, Docklands Light Railway and, since 2007, on National Rail services.
When it comes to getting around, London is divided into 'zones' 1-9, with 'Zone 1' being the city centre and 'Zone 9' being the outskirts of the city. The system itself exists as a method for TfL (Transport for London) to calculate a customer's travel distance and charge accordingly.
Purley railway station is in the London Borough of Croydon on the Brighton Main Line, 13 miles 29 chains (21.50 km) measured from London Bridge (15 miles 13 chains (24.40 km) from Charing Cross), in Travelcard Zone 6.
It was opened on 22 August 1848 by the Windsor, Staines and South Western Railway (later the London and South Western Railway). It is 14 miles 68 chains (23.9 km) down the line from London Waterloo and is in Travelcard Zone 6.
A Travelcard gives you unlimited travel within London zones 1-4 or 1-6 on the Underground, Overground, TfL Rail, Docklands Light Railway, buses, trams, and most National Rail services in London*.
Covent Garden is a London Underground station serving Covent Garden and the surrounding area in the West End of London. It is on the Piccadilly line between Leicester Square and Holborn stations and is in Travelcard Zone 1.