Tom M from Raleigh NC on 4/26/2017 9:46:54 AM:
As others mentioned, a trike would be fine on the GAP, but not the C&O. Many sections of the C&O are single track with muddy ruts, potholes, roots, etc. The tunnel at Paw Paw would be a challenge.
During one of my trips on the GAP-C&O we stayed at an inn in Cumberland, MD, where some other riders had abandoned their tricycles. One of them actually got damaged trying to ride the C&O. They left their trikes at the inn while they went to get their vehicle to retrieve them, and cancelled the remainder of their trip.