The concept need considerable refinement. The second Pentagon station is in the wrong place, it should be next to the existing station with the route from Rosslyn tunneling under Washington Boulevard to get to the south end of the station.
The second Rosslyn station as a 90 degree transfer station seems redundant, build the second Rosslyn as depicted in my 2030 track schematic
, The "express" from Rosslyn to Falls Church would run under the existing K route along Wilson Boulevard and Fairfax Drive, on the existing K route tracks along VA I-66 from the portal to Great Falls Street, the existing K route would run on track above the existing tracks, a second platform would be built above the existing platform at the East Falls Church station.
What is the purpose of the station in East Potomac Park? There isn't enough tourist traffic to justify it unless the federal government wants the pay for 100% of the capital cost to build it like they did for the Arlington Cemetery station. What happened to the Yellow line between Pentagon and L'Enfant Plaza? Does WMATA intend to abandoned that route or keep it to allow for operational flexibility.
Also what's up with 2 stations near the Capitol? Seems kind of redundant to me.
The Loop station at Union Station should not be behind to railroad station in should be in front under Columbus Circle, west entrance would utilize the existing west portico entrance to the existing station, east entrance on the south side of Massachusetts Avenue between 1st and 2nd Street NE
Give me some time and I will draw my refined versions in alignment format and track schematic format.
John in the sand box of Maryland's eastern shore.