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The Fairfax County Board of Supervisors approved the terms of a $403 million loan from the U.S. Department of Transportation for the second phase of Metro’s Silver Line. The federal loan will cover about 45 percent of the estimated $915 million for the new rail line. Completion of the second phase is expected in 2018 and will connect Metro to Dulles International Airport. The total cost for the entire Silver Line is now $5.6 billion.