That same route also contains evidence of the former Southern Pennsylvania Iron and Railroad Company right of way, and a bridge that I've blogged about previously, here (where I have a couple additional photos at bridge level).
This is an abandoned Pratt Through Truss bridge (circa 1896) over Conococheague Creek:
[Image credit: a way cool site called Bridgehunter]
A couple of miles further west the railroad right of way runs through what now is a pasture. The embankment is largely gone, but the farmer wisely saved a small bridge that carried the railroad across a small stream:
[Image credit Gary]
Last view is just of the abandoned grade of the railroad, right near the Stone Bridge:
[Image credit Gary. This section, unfortunately, is on private ground that is posted with No Trespassing signs]