WASHINGTON — The Loudoun County, Va., Board of Supervisors voted 5 to 4 to go ahead with the county's participation in the second phase of the Washington Metrorail's Silver Line extension, committing it to provide about $270 million of the $2.7 billion in construction costs of that phase of the controversial and largely bond-backed project.

The board faced a July 4 deadline to choose whether or not to opt out of the proposed 23-mile train that will connect Dulles International Airport and Loudoun County with the District of Columbia and the surrounding suburbs. The total project is expected to cost $6 billion.

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