Heathrow Terminal 4 tube station
Overview
 
Heathrow Terminal 4 is a London Underground
London Underground
The London Underground is a rapid transit system serving a large part of Greater London and some parts of Buckinghamshire, Hertfordshire and Essex in England...

 station at Heathrow Airport
London Heathrow Airport
London Heathrow Airport or Heathrow , in the London Borough of Hillingdon, is the busiest airport in the United Kingdom and the third busiest airport in the world in terms of total passenger traffic, handling more international passengers than any other airport around the globe...

 on the Heathrow branch of the Piccadilly Line
Piccadilly Line
The Piccadilly line is a line of the London Underground, coloured dark blue on the Tube map. It is the fifth busiest line on the Underground network judged by the number of passengers transported per year. It is mainly a deep-level line, running from the north to the west of London via Zone 1, with...

. The station is situated in Travelcard Zone 6
Travelcard Zone 6
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...

.

The station opened on the 12 April 1986 to serve the then recently opened Heathrow Terminal 4. It is situated on a unidirectional loop tunnel which was constructed between the existing Hatton Cross
Hatton Cross tube station
Hatton Cross tube station is on the Heathrow branch of the London Underground Piccadilly line. It is in Travelcard Zones 5 and 6 and stands between the Great South West Road and the Heathrow Airport Southern Perimeter Road....

 and Heathrow Terminals 1, 2, 3 stations. The station is one of the few on the London Underground to have only one platform, and is the only one with one-way train service.

In-service routing took trains from Hatton Cross to Terminal 4 then Terminals 1, 2, 3 and back to Hatton Cross.
 
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