The first track to be used by Crossrail trains has been laid on the new Stockley Flyover in west London.
The 120 m Stockley Flyover will be used by Heathrow Express and Heathrow Connect services from next year and is the largest single-span bridge to have been installed on the Great Western railway since the days of Brunel.
Crossrail surface director Matthew White said: “Installing the first section of Crossrail track is a major milestone for the project.
The flyover at Stockley will provide a vital new link between Heathrow and London, significantly improving connections between the airport and the West End, the City and Canary Wharf.”
Network Rail’s Crossrail programme director Matthew Steele said: “The Network Rail and Carillion teams are really proud to deliver the first section of new railway for Crossrail.
“Once Crossrail is operational, this brand new structure will enable us to increase the number of rail services between central London and Heathrow airport.
“After four years of planning, it is great to see this new infrastructure being brought into service; well done to everyone involved.”
Crossrail services between London Paddington and Heathrow will begin in 2018.