The airports authority in charge of building the Dulles Metro rail project is now considering letting private investors help finance the nearly $6 billion project.

The announcement comes after months of negotiations in which the Metropolitan Washington Airports Authority pressed the federal government and Virginia Gov. Bob McDonnell’s office for hundreds of millions in aid and loans to help pay for the project’s second phase, which would extend the rail line from Reston to just past Dulles International Airport.

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