From the pastor of my wife's church regarding transit for DC's march:
Women's March metro update from Dr. Gridlock: Metrorail will open two hours early, at 5 a.m.
Trains will leave end of the line stations every 12 minutes, trains will depart stations at the end of each line every 12 minutes, resulting in service every four to six minutes at downtown stations.
More than a dozen trains will be added to the Red and Orange lines to accommodate expected high ridership.
Metro will add trains between Franconia-Springfield and Greenbelt, running on the "Rush Plus" route via the Yellow Line Bridge from approximately 6 to 10 a.m. and 1 to 5 p.m.
I call this good news because it's so much better than the original plan, which was to offer regular Saturday service.
This part is just a guess: I think most people heading for the march will want to be there for the rally part, which is from 10 a.m. to about 1:15 p.m. Saturday at Independence Avenue and Third Street SW. Also, many people will be arriving by charter buses, which will park at RFK Stadium and I don't believe they'll have any control over the buses' arrival times.
So I expect Metrorail -- especially the Blue, Orange and Silver lines -- will be crowded for several hours before the rally starts at 10 a.m. and stay that way for a long time, even with the additional service.
L'Enfant Plaza and Federal Center SW are likely to be particularly troublesome for Metrorail riders, since they are the stations south of the Mall that are closest to the rally.
Rather than delaying their arrival at the event, some folks may want to get off trains at stations farther away, including the Red Line stations north of the Mall, even if it means a longer train ride and a longer walk.
I'm a bit less worried about the afternoon trips back home, though there could be some problems here as well. I'm less worried about the p.m. for this reason: The march gets underway after the rally and is supposed to end near the Washington Monument and Ellipse. The dispersal is likely to be more gradual than the assembly. Still, the nearby Metro stations at Federal Triangle, Farragut West and Smithsonian are likely to be very crowded.
Bring a map. You may need to walk to a Metro station farther away than the one you had planned to use for the trip back to Virginia.