A federal appeals court has refused to block the use of toll revenues to complete the construction of a commuter rail linking the Washington, D.C., suburbs and Dulles International Airport.

A three-judge panel of the U.S. Court of Appeals for the Fourth Circuit on Monday affirmed a decision by U.S. District Judge James Cacheris of the Eastern District of Virginia to dismiss on summary judgment a putative class action challenging the project.

The Metropolitan Washington Airports Authority is currently extending what is locally known as the Silver Line to Dulles, which is located in Loudon County, Virginia, about 26 miles from Washington. Dulles is the region's major international airport, and is primarily accessed by a toll road.