Great story in the Pittsburg Post Gazette about cycling the 305 miles from Pittsburg to Washington DC - It takes 7 days.
The route: Most people riding from Pittsburgh to Washington, D.C., start outside the city at McKeesport or the Boston portion of Elizabeth Township. From those points on, the trip is all on dedicated biking-hiking trail, except for a six-mile detour during the Chesapeake & Ohio Canal Park portion of the journey.
The route uses two major trails.
The Great Allegheny Passage covers about 130 miles from McKeesport to Cumberland, Md. It follows the former route of the Western Maryland Railroad, which was primarily a coal-hauling line. Making use of dozens of trestles, bridges and embankments, the route was laid out to minimize changes in elevation as its winds its way southeast. For much of its length it follows the path that the Youghiogheny and Casselman rivers have cut through the Allegheny Mountains.
The trail then continues through the C&O Canal Park, and it is all gently downhill from Cumberland to Washington's Georgetown neighborhood. Along its route are the remains of 75 locks, 11 stone aqueducts and dozens of locktender houses.Read more at www.post-gazette.com