https://www.wmata.com/initiatives/plans/BOS-Study.cfm
The Georgetown tunnel could pop up as a recommendation, also interesting to note that one of the graphics seem to suggest possibly running more than 26 trains per hour thru DC (even though they refuse to do so ATM)
The Georgetown tunnel could pop up as a recommendation, also interesting to note that one of the graphics seem to suggest possibly running more than 26 trains per hour thru DC (even though they refuse to do so ATM)