How Will HS4Air Affect Heathrow Southern Railway?
Heathrow Southern Railway will be an East-West railway through Heathrow using the existing tunnels, which will connect Basingstoke and Woking to Pasddington via Heathrow and Old Oak Common.
On the other hand HS4Air will be a North-South railway through Heathrow probably in a deep tunnel.
I suspect that numerous escalators, lifts and travelators will be the only connections between the two railways and the various terminals in the airport.
Conclusion
I can see no reason, why both railways can’t be built separately.
Co-operation could be useful to both railways.
If the two railways have a well-designed interchange under Heathrow, this would open up journey possibilities like Southampton-Paris with a change at the airport.
HS4Air is more than just a railway connecting airports and the North of England to the Channel Tunnel.
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