Travelcard Zone 6

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Fare zone 6 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. The zone was created in January 1991; from May 1983 it had formed part of zone 5. It extends from approximately 12 to 16 miles from Piccadilly Circus.

The following stations are within zone 6:

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Wikipedia