W&OD ran from Potomac Yard vincinity in Alexandria VA, out the west corridor through Viena, Herndon, etc, out to around Bluemont, close to the VA/WVA border in NW VA.
The road was turned into two things post-end-of-service. The inner part, in Arlington County, was mostly razed as a part of the constuction of Interstate 66 and the WMATA Metrorail. The outlying parts (from inside Arlington well out to the west) was converted into the Washington & Old Dominion RR Bike Trail. It's a nice trail, imo.
Tis a shame though, a rail right-of-way from Alexandria thru to almost West VA would be worth more than gold in traffic clogged NoVA these days.
For any interested in this small, rather unimportant road (That I love), I would suggest the following book:
