The Western Rail Approach to Heathrow is a proposed rail link in Berkshire and Buckinghamshire, England, which would create an additional connection between London's Heathrow Airport and the Great Western Main Line. Beginning at Heathrow Terminal 5 station, the link would run via a tunnel to a junction east of Langley station, allowing trains to run westwards towards Slough, Reading and beyond. When completed, the link would improve rail connections to Heathrow from the Thames Valley as well as from South West England, South Wales and The Midlands. It would also reduce congestion at London Paddington station by removing the need for Heathrow passengers on this route to travel to Hayes and Harlington or into central London.