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- Silver Line in Loudoun County
Washington Metropolitan Area Transportation Authority (WMATA) provides Silver Line Metrorail Service to and from the Dulles Airport, Loudoun Gateway and Ashburn Metro Stations in Loudoun County.
The Silver Line in Loudoun County, constructed by the Metropolitan Washington Airports Authority (MWAA), is a 23-mile Metrorail extension of the regional Metrorail system.
The Silver Line Extension began passenger service on November 15, 2022.