Heathrow Airport is on which London underground line?
Heathrow Airport transport proposals years of its operation, public transport links to Heathrow Airport were provided by airport buses. Rail connections to Heathrow Airport began in 1977 with the extension of the London Underground Piccadilly line to Heathrow Central tube station (now Heathrow Terminals 2 & 3). The Tube was extended to Terminal 4 in 1986 and Terminal 5 in 2008. A new airport rail link opened between Heathrow and London Paddington station in 1998, when the Heathrow Express service began. This mainline rail service is due to be extended to central London and Essex when the Elizabeth line, currently under construction, opens in
Heathrow Airport transport proposals between Heathrow and via the Chiltern Main Line and the Dudding Hill Line to connect with the Midland Main Line at a "Cricklewood Interchange" station. Two schemes known as SuperCrossrail and Superlink were put forward in 2004 by a group of rail industry managers as alternative proposals to the Crossrail route being planned at the time. They proposed connecting a number of regional stations such as , , and via a new underground railway through central London, with a station at Heathrow Airport. The scheme was rejected by planners in favour of the simpler Crossrail route. In 2009, Heathrow Airport