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Fairfax and Loudoun have tentatively agreed to assume the costs of a rail station and parking garages as part of a cost-cutting deal to trim about $1 billion off of the price tag for Phase 2.

Phase 1 of the project, which will stretch from East Falls Church to Wiehle Avenue in Reston, is scheduled to be completed in late 2013, according to MWAA. Phase 2, which will extend through Dulles Airport into Loudoun County, is scheduled to open in 2016.

Drivers now pay $2 one way on the road, and some projections have put the cost of a full one-way trip between $10 and $20 by 2040, depending on whether the federal government chips in low-interest Transportation Infrastructure Finance and Innovation Act (TIFIA) loans.

MWAA spokesman Rob Yingling, however, cautioned that any such estimates were based on old data, that a new traffic and revenue study is currently under way, and cost projections for Phase 2 of the project have not yet been finalized.