This marks the second major commuter rail line opening this year under the Eagle PPP project following the opening of the University of Colorado A Line, connecting Denver Union station and Denver International Airport, in April.

The B Line connects Westminster with Union Station, an interchange for the C, E, and W light rail lines, the A Line, and local and regional buses. Services on the B line will run every 30 minutes in peak times and hourly in the off-peak.

The new line serves the northwest region of the Denver-metro area, and will be maintained and operated by a joint venture of Fluor, Denver Rail (Eagle) Holdings, John Laing, and Aberdeen Infrastructure Investments.

The Eagle PPP project is part of the Fastracks plan to build 196.3km of commuter rail and light rail, 29km of bus rapid transit service, and 21,000 new parking spaces. Also, the project entails the redevelopment Denver Union Station and redirecting bus services to better connect the eight-county district.