DALLAS — The winning bidder for Denver’s 23-mile rail line from downtown to Denver International Airport says it can bring the project to completion 11 months earlier than expected and $300 million under budget.

The long-sought commuter line is one of the showpieces of the Regional Transportation District’s $6.5 billion FasTracks project, which aims to add 122 miles of commuter and light rail, 18 miles of bus rapid-transit service, and 21,000 parking spaces, along with redeveloping the landmark Denver Union Station as a transit hub in lower downtown. FasTracks is designed to be one of the largest public-private partnerships in the nation.

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