HS4Air was a proposal for a 140-kilometre (87 mi) high-speed railway line in the United Kingdom, put forward in 2018 by a British engineering consultancy, Expedition Engineering. The proposed line would have connected the planned High Speed 2 line to the High Speed 1 line via a high-speed route running south of London, and would have formed a direct rail link between Heathrow and Gatwick airports.
HS4Air was a proposal for a 140-kilometre (87 mi) high-speed railway line in the United Kingdom, put forward in 2018 by a British engineering consultancy, Expedition Engineering. The proposed line would have connected the planned High Speed 2 line to the High Speed 1 line via a high-speed route running south of London, and would have formed a direct rail link between Heathrow and Gatwick airports.
Source: Wikipedia "HS4Air" · CC BY-SA 4.0
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