WASHINGTON - Amtrak's roughly $7 billion master plan for a complete overhaul of Washington D.C.'s Union Station would likely involve a large collaborative effort mixing public and private funding sources, according to a company spokesman and industry experts.

The 15-20 year overhaul plan, announced Thursday, was developed in cooperation with the U.S. Department of Transportation, Virginia Department of Rail and Public Transportation, Virginia Railway Express, Maryland Transit Administration, Washington Metropolitan Area Transit Authority and development firm Akridge, Amtrak said. The plan includes the estimated cost and timetables, but identifies no specific sources of funding that would allow the plan's grand reconstruction of the station and added high-speed rail infrastructure.

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