On our next trip we will be staying near the CH Metro station, on the Orange Line. But we'll be spending a good deal of our time up around Columbia Heights, on the Green/Yellow lines. Coming back means changing trains at L'Enfant, as best we can tell. So, if the Orange Line is 20 minutes out but a Blue Line train is about to arrive, would you take the Blue and walk from Rosslyn or get out your Kindle and wait for the Orange? Safe to walk, say 10+ PM, Fri-Sat-Sun nights, a couple of 60+ folks? Thanks, and please let me know if I'm not thinking about this correctly.