The HS4Air initiative proposed a high-speed rail link between Heathrow and Gatwick, aiming to create a 15-minute journey and alleviate pressure on London's transport.
The plan was to connect High Speed 1 to the future HS2 with a new 87-mile line around southwest London, enhancing airport access from major cities.
Despite its potential to improve connectivity, the HS4Air project was rejected by the government for financial and community opposition reasons, stalling any further progress.
HS4Air highlighted the struggle of ambitious transport projects against economic viability and local acceptance, with the plan remaining just an unrealized concept.
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