Review: We were riding the C&O from Cumberland to DC, but decided to start on top of the mountain ridge on the Allegheny trail in Deal, PA. It was the best decsion we made the entire trip. So we only rode the last 20 or so miles of the Allegheny but it was great. The trail surface is smooth as can be short of asphalt. You go through two long tunnels, cross the eastern continental divide and the Mason Dixon line and are also treated to some great scenic overlooks. And of course its all downhill into Cumberland, MD on a moderate grade that any age bicyclist will enjoy. When you get to the bottom of the hill in Cumberland, stop at the bike shop at mile zero of the C&O trail. The guys there are great and they will get you tuned up for the 184 miles to DC.