The old railroad bridge over Route 1 at Fort Belvoir was removed late last month. This was part of the old Newington-Ft. Belvoir Railroad or the "The U.S. Army Railroad, Fort Belvoir, Va." a 4-5 mile long railroad built in 1917 that supplied coal and equipment to the base as well as serving as troop transport right up to the Korean War. Rail operation ceased in 1993 and VRE has at times talked or running commuter trains on it all the way to Route 1. But Route 1 is being widened so the old railroad bridge has to go.
Back in 2008 I suggested that the ROW could be used to build a bike trail from the Fort to the Franconia Springfield Metro Station. It's still a workable idea, but another Route 1 crossing would obviously be needed.
It's not clear what is to be done with the old bridge, if any thing at all.