Unlike
Disneyland, at DCA they have a full loop backstage with access to the parade building from both sides so a parade is not stuck at one end or another. That was a specific layout design from day 1 after learning their lessons in DL and the limitations there.
Not sure of the direction of two PTN, but at DCA it does not need to be one direction then the other in a two show night. They can both runs the same direction in the same night.