Separated Silver Line: This option would shave a few minutes off of trips from Downtown to Tysons Corner and Dulles, but it would not add much capacity to the system. Instead of a new Blue Line subway along M Street, that line would be given over to Silver Line trains. Blue and Orange Line trains would continue to share tracks in DC.
The Silver Line would also get its own tracks in much of Arlington. After Rosslyn, the line would run "express" along I-66, with East Falls Church as its first stop after Rosslyn. It would share tracks with the Orange Line along I-66 before diverging to head out along the Dulles Toll Road toward Tysons.
Click here for the full rundown of ideas on Metro's "second generation."
Pardon some cynicism here, but we can't even get the first generation of the Silver Line built right for a price we can afford. How does WMATA--which isn't contributing one dime to the Silver Line construction--expect to build a separate Silver Line and many other upgrades??