The Federal Transit Administration yesterday gave final design approval and $158.7 million of federal funding to the $5 billion Dulles Metrorail extension project, citing a "substantially improved" proposal, FTA officials said.

But the rest of the $900 million of federal funds that Virginia officials say are needed for the project remain in limbo over several concerns, including whether the project can be completed on time and within the budget, FTA administrator James S. Simpson said yesterday in a conference call.

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