Heathrow Terminal 5 station

Heathrow Terminal 5 station is a shared railway station at London Heathrow Airport Terminal 5 which was opened on 27 March 2008. It was designed by architects HOK International in conjunction with Rogers, Stirk, Harbour & Partners.
The station is staffed by Heathrow Express staff unlike the underground stations at Heathrow Terminal 4 and Heathrow Terminals 1, 2, 3. The London Underground section of the station is situated in Travelcard Zone 6. It is the westernmost below-ground station on the London Underground network.
Until 2012, free transfer was not possible between terminals via the Underground, in contrast to the Heathrow Express. In January 2012, free travel was introduced for Oyster card holders between the Heathrow stations on the Piccadilly line. Journeys from Heathrow Terminal 5 to Terminal 4 via the Piccadilly line require a change at Hatton Cross; this journey is free, despite Hatton Cross not being part of the free travel zone.
Although situated underground, parts of the station's roofing are made of translucent ETFE laminate panels, allowing natural daylight to flood down both ends of all six platforms.