Here it is, Reinhart tunnel, 617′ long and with a 1924 refacing. It’s just across a trestle over Hwy 63 from Perkins tunnel. It centers at 37.157979, -82.372536. When I checked this tunnel out on Google Earth, I noticed that there’s an obvious track of the tunnel in the overburden. That was the first time I’d noticed that, but it happens with nearly all tunnels, unless the overburden is quite thick.
Blogging the Railroad Tunnels 
The mention of “track of the tunnel in the overburden” … What you are seeing is likely the clearing and / or roadway made for signal and telegraph lines, which were run on the purchased right of way, straight and narrow as the tunnel. These paths were kept free of trees and brush until about 1960s. Then wires were replaced with radio and fiber optic cables.
I hadn’t thought of that. Thank you. Makes sense to me!