It's nice! I know there were talks about having an express train to Dulles that skipped a lot of the local VA stops, but it was determined that wouldn't save much time since you'd be limited by the next train at a point with the lack of express tracks :(

Riding it recently, I was thinking they should continue tracks in the median of 267 next to Tysons between 123 and route 7, so an express train could skip local Tysons stops and leapfrog a train there. It would be very little track to add and would probably make a significant difference in travel time. Unfortunately, it'll never happen that way though