Transportation Secretary Ray LaHood says a deal has been reached on funding the $2.8 billion second phase of the project to extend Metrorail to Dulles International Airport and Loudoun County.
Construction has already begun on the first phase, which extends Metro from Falls Church through Tyson's Corner, but there had been a dispute as to who would pay for the final stretch of the project.
The agreement calls for Virginia to commit $150 million in state funds, and the federal government to provide loan assistance to Fairfax and Loudoun Counties, as well as to the Metropolitan Washington Airports Authority. Future increases in tolls on the Dulles Toll Road will also help pay for the project.
A recent decision to build the metrorail station at Dulles Airport above ground instead of below has also helped lower the overall cost.