The $5.2 billion Dulles Metrorail extension, all but dead nearly a year ago, was revived Wednesday when the Federal Transit Administration signed off on the plan, essentially guaranteeing $900 million of funding for a project that will be partly financed with more than $2 billion of tax-exempt bonds.

The 23-mile project still needs final approval from Transportation Secretary Mary Peters and the Office of Management and Budget, along with Congress, but the FTA's approval signals the extension will move forward.

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