Heathrow Terminals 2 & 3 is a London Underground station at Heathrow Airport on the Heathrow branch of the Piccadilly line, which serves Heathrow Terminal 2 and Terminal 3. It was named Heathrow Terminals 1, 2, 3 until January 2016, when Heathrow Terminal 1 was closed. Despite the renaming of the station, the signage on the platform still says Heathrow Terminals 1, 2, 3 as of June 2022. The station is situated in Travelcard Zone 6, along with the nearby Heathrow Terminals 2 & 3 railway station served by Heathrow Express and Elizabeth line services. History The station opened as Heathrow Central on 16 December 1977 as the final phase of the Piccadilly line's extension from Hounslow West to the airport. The preceding station, Hatton Cross, had opened as the interim terminus in 1975. At its opening, the station served as the terminus of what became known as the Heathrow branch of the line – previously it had been the Hounslow branch. It was the first time that an airport had been directly served by an underground railway system. With the development of the airport's new Terminal 4 underway for which a separate Underground station would be provided, the station was initially renamed Heathrow Central Terminals 1, 2, 3 from 3 September 1983, then renamed Heathrow Terminals 1, 2, 3 on 6 October 1986. The Terminal 4 station is located on a unidirectional single track loop from Hatton Cross to Heathrow Terminals 2 & 3. On the opening of the Terminal 4 station, most direct services from Hatton Cross to Terminals 2 & 3 ceased, with most Piccadilly line trains going first to Terminal 4. This meant that the westbound tunnel direct from Hatton Cross to Terminals 1, 2, 3 was hardly used for over 20 years. However, some early morning trains still went directly to Heathrow Terminals 1, 2, 3. For the construction of the tunnel to the new Heathrow Terminal 5 station, the loop track and Terminal 4 station closed temporarily on 7 January 2005 and Heathrow Terminals 1, 2, 3 once again became the terminus of the line. This situation continued until 17 September 2006, when the Terminal 5 tunnel works were sufficiently complete for the loop tunnel and Terminal 4 station to reopen. Heathrow Terminal 5 station opened on 27 March 2008, but the frequency of trains on the Heathrow branch of the Piccadilly line remained