I opted to show the approach and the tunnel because the tunnel isn’t particularly interesting. No date, but it was constructed in the 1940s when the L&N opened up the Leatherwood Branch (KY) to bring out coal from the massive Blue Diamond Mine complex. This portal is at 37.09080, -83.10304. The tunnel, a little over .25 mile long, curves through a ridge at a bend of Leatherwood Creek. The track here actually dates to 1940, mostly Bethlehem Steel rail. There are two trestles here: the closest is timber construction and the far one is deck girder, with no maker name/date plate. It didn’t appear to have ever had such a plate.
This is looking easterly. The track curves to the right practically at the portal. The line then goes on to what is now a partial wye over the North Fork of the Kentucky River down at the end of Dent Yard.