WASHINGTON — A U.S. appeals court this fall will take up a lawsuit that challenges the use of toll revenues to back bonds for the Washington Metrorail’s Silver Line extension to Dulles International Airport, potentially threatening a key funding mechanism of  the project.

The U.S. Court of Appeals for the Federal Circuit will weigh whether using revenues from the Dulles Toll Road to pay for more than $2 billion in debt to fund the Silver Line constitutes an illegal tax, according to an attorney representing two Northern Virginia residents who filed the suit against the Metropolitan Washington Airports Authority in April of last year.

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