Following the consultation which closed on Tuesday (April 5), it has claimed the sooner the service can take off the better, as it will provide a vital connection for passengers and businesses from the west and south west to the hub airport.
The improved and faster access to Heathrow would benefit people travelling from the Thames Valley area, between Reading and Heathrow, without the need to change at Paddington station.
The move would provide alternative transport to the airport which Heathrow claims would benefit two million people and some of its airport workforce who currently travel by road.
It would ease congestion on the roads by up to one million cars and lower CO2 emissions as well as add £800m of additional economic growth across the Thames Valley and surrounding areas.
Another recent study by Network Rail proposes a new rail link between Heathrow and Waterloo.
Chris Joyce, head of surface access at Heathrow, said: “Given the potential of Western Rail Access and the wave of support behind it, we urge Network Rail and the government to work with stakeholders to deliver this vital link so that the economic and environmental benefits it can create are secured, and delivered as soon as possible.”
The proposed project will tunnel a link of 3.8km from a junction on the Great Western Main Line near Slough, running four trains per hour between Reading and Heathrow.
This link, together with HS2 via Old Oak Common , Crossrail and Southern Rail could see Heathrow Airport add a further 3m annual passenger journeys by public transport by 2020 and eventually treble its rail capacity by 2040.