This is the southerly portal of a long, 1/4 mile or so, tunnel on the CSX near Cawood KY. Anecdotal evidence (I’m still doing research) indicates that this line was laid down in the late 20s, but the date on this portal, if there ever was one, has been eroded away. This portal is at 36.77949, -83.24325. A picture of this on Google Earth is titled as being near “Bob’s Creek”. Not my creek, no sir.
Blogging the Railroad Tunnels 