The Colorado Regional Transportation District (RTD) in the US has selected a private consortium to construct and operate the $2.1bn portion of Denver International (DI) FasTracks.
US-based Fluor Enterprises and Australia's Macquarie Capital Group and transit contractor Balfour Beatty Rail are the group involved in the public-private partnership.
The Denver Transit Partners consortium is estimated to fund $1.3bn of the project, while RTD will provide about $777m with a planned saving of roughly $300m.
The project will see a commuter train line running between Denver International Airport and Union Station.
The consortium will open the DI FasTracks line in January 2016 with the first phase of work on the 23-mile rail line to begin this year.
The second phase involves building a 11.2-mile Gold Line and a short segment of the Northwest train line to Westminster, according to denverpost.com.
Denver Transit is expected to handle and manage the FasTracks train lines for 40 years following the start of passenger service.
The contract is part of the $6.5bn FasTracks project.