John W. from Pittsburgh, PA on 3/8/2015 4:21:38 PM:
Roll on service, if actually happening, is the best bet. Until that is 100% a sure thing, I would look into one way rentals. I rented from Pittsburgh Airport and drove to Dulles, checked the car in, connected by bike to the Washington & Old Dominion Trail, got off the W&OD and took my bike on the Metro at Dunn Loring (it was a Sunday, you can't do this during weekly rush hours) and got off at Foggy Bottom. From there it was a short ride to the beginning of the C&O. Maybe I didn't look hard enough but the 3-4 rental places told me they didn't do one way rentals at Reagan National Airport which would have saved me 15 or so miles but I suspect you can do this.