<Ul> <Li> view </Li> <Li> talk </Li> <Li> edit </Li> </Ul> <P> The Silver Line of the Washington Metro in the United States consists of 28 existing and six planned rapid transit stations from Wiehle--Reston East to Largo Town Center . It has stations in Fairfax County and Arlington, Virginia, the District of Columbia, and Prince George's County, Maryland . Five stations are shared with the Orange Line alone, thirteen with both the Orange and Blue lines from Rosslyn to Stadium--Armory, and five stations shared with the Blue Line to both lines' eastern terminus at Largo Town Center . Only five existing stations are exclusive to the Silver Line, which began service on July 26, 2014 . </P> <P> The 11.7 miles (18.8 km) portion of the Silver Line between its split from the Orange Line and Wiehle--Reston East station is in Fairfax County, Virginia and was constructed as Phase 1 of the Dulles Corridor Metrorail Project . Phase 2 expands the line another 11.5 miles (18.5 km) to Loudoun County via Washington Dulles International Airport and adds six stations to the line . Preliminary construction of Phase 2 began in 2014, with an opening scheduled for sometime in 2020 . The $6.8 billion project is the largest expansion by route mileage since the inception of Metro in 1976 . </P> <P> The Silver Line has two primary goals . The first is to link Washington, D.C. by rail to Washington Dulles International Airport and the edge cities of Tysons Corner, Reston, Herndon, and Ashburn . The second is to spur urban development in Tysons Corner and reduce overall reliance on highway traffic in the business district, Virginia's largest and the 12th - largest in the country . The district's area is comparable in size to downtown Washington, D.C., but is rather insulated from its surrounding neighborhoods and has no existing grid pattern in its streets . The Silver Line would also improve public access to the Udvar - Hazy Center, an annex of National Air and Space Museum located near Dulles Airport; after the opening of the first phase of the Silver Line, Fairfax Connector began running shuttles to the museum from Wiehle--Reston East . </P>

When will the metro line to dulles be finished