Private firms urged to submit plans for a railway between Heathrow Airport and London Waterloo and the line could open by 2025

A private company called Heathrow Southern Railway (HSR) has been set up to promote the project, and several firms are assessing possible options for the route.

HSR says the line could be open by 2025 and would be used by 33,000 passengers per day due to significantly reduced journey times from many locations.

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