A joint venture between Italian infrastructure group Salini Impregilo and Australia's NRW Pty Ltd. has secured a contract worth AUD1.176bn ($898m) from the Public Transport Authority of Western Australia to design, build and maintain the Forrestfield-Airport Link in Perth, Australia.The underground passenger rail line project will connect the eastern suburbs of the city with an existing suburban rail network as well as the airport. It will measure 8.5km in length, of which 8km will be underground.The JV will bore twin tunnels for the entire length of the line and build three stations. Parking spaces and new and expanded bus feeder services will also be built. The rail line will be tunnelled underground from a junction near Bayswater Station, under the Swan River and the airport.Western Australia’s premier Colin Barnett said: "This is a huge milestone on the path to delivering this project, which will change the face of Perth's eastern corridor and give people direct access to the airport by public transport."Early work worth AUD370m ($281m) comprising geotechnical work, contract management and land purchases is already underway. Work at the site is scheduled to begin shortly, and the line is expected to open in 2020.