Between 1924 and 1931, a narrow-gauge railroad hauled coal from the Crummies Creek mines to a prep plant on the other side of the mountain on Cemetery Road near Crummies, KY*.  This portal, probably dynamited and then filled in, is near 36.78559, -83.21749.  Good luck trying to find it on Google Earth.  We nearly missed it ourselves.  When I took this picture, I was standing on top of the fill looking into the tunnel right at the top. I could feel cool air blowing out, so the tunnel’s not completely filled in.
On the prep plant side, there were several L&N lines that used a double-track loader.   The tracks are gone now.

 

 

 

 

 

*The Kentucky place name list tells me that a “crummy” or “crummie” refers to an animal that has crooked horns.