Heathrow Terminal 4 tube station

Heathrow Terminal 4
Entrance from terminal
Heathrow Terminal 4 Location of Heathrow Terminal 4 in Greater London
Location	Heathrow Terminal 4
Local authority	London Borough of Hillingdon
Managed by	London Underground
Owner	Heathrow Airport Holdings
Number of platforms	1
Accessible	Yes
Fare zone	6
London Underground annual entry and exit
2012	2.44 million
2013	2.43 million
2014	2.13 million
2015	2.35 million
Railway companies
Original company	London Regional Transport
Key dates
1986	Opened
2005	Temporary closure
2006	Reopened
Other information
Lists of stations	DLR Underground National Rail Tramlink
WGS84	51°27′32″N 0°26′46″W / 51.459°N 0.446°W / 51.459; -0.446Coordinates: 51°27′32″N 0°26′46″W / 51.459°N 0.446°W / 51.459; -0.446

Heathrow Terminal 4 is a London Underground station at Heathrow Airport on the Heathrow branch of the Piccadilly line. The station is situated in Travelcard Zone 6.

The station opened on 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 and Heathrow Terminals 1, 2, 3 stations. The station is one of four on the London Underground to have only one platform, and is the only one with one-way train service. It is adjacent to Heathrow Terminal 4 railway station used by main line Heathrow Express railway services.

In-service routing took trains from Hatton Cross to Terminal 4 then Terminals 1, 2, 3 and back to Hatton Cross. On 7 January 2005, both the loop track and the station were closed temporarily in order to allow the construction of a new rail junction to link to the new Heathrow Terminal 5 station. All trains reverted to using the original westbound track from Hatton Cross direct to Heathrow Terminals 1, 2, 3 which was used prior to the opening of Heathrow Terminal 4. For passengers travelling to or from Heathrow Terminal 4, a shuttle bus was provided from Hatton Cross tube station. This situation continued until 17 September 2006 when the loop line and station were reopened following completion of the construction, and with new security and customer announcement technologies in place at the station.

Heathrow Terminal 4 tube station is located on a unidirectional clockwise loop that branches off after Hatton Cross westbound, and rejoins the Heathrow branch eastbound to the west of Heathrow Terminals 1, 2, 3.

Since the opening of Heathrow Terminal 5 station, the service pattern is that every other Heathrow branch train runs via the Terminal 4 loop, whilst each alternate train runs directly to Heathrow Terminals 1, 2, 3 tube station and Heathrow Terminal 5.