Travelcard Zone 4

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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. It was created on 22 May 1983 and extends from approximately 6.75 to 10 miles (11 to 16 km) from Piccadilly Circus.

The following stations are within zone 4:

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Wikipedia