Heathrow Express is a high-frequency airport rail link operating between London Heathrow Airport and London Paddington. Opened in 1998, trains run non-stop, with a journey time of 15 minutes. The service is operated jointly by Great Western Railway and Heathrow Express Operating Company, a wholly owned subsidiary of Heathrow Airport Holdings. Heathrow Express was planned as a joint venture between the British Airports Authority (BAA) and British Rail, but was taken over fully by the former following the privatisation of British Rail. Construction began in 1993. The principal works were two 6.8 km (4.2 miles) single-bore tunnels (including eight escape shafts) and underground stations at Heathrow Central and Terminal 4. Electrification of the Great Western Main Line (GWML) between Paddington and Airport Junction, where the new line diverged from the GWML, was also required. A flying junction known as 'Stockley Flyover' was constructed to connect the tunnel to the GWML fast lines. During construction, a notable tunnel collapse occurred including the subsidence of a surface building, leading to a six-month delay in opening and additional costs of around £150 million. More information...
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