E&BV subdivision tunnel

This is just outside Martin (old Beaver Creek) KY on what was once called the Elkhorn and Beaver Valley Railroad (there’s a split in Martin: the E&BV went west, the Long Fork subdivision went south).
martintunnel

It’s supported by wood bracing and framing.  This line was built in the 1913-1914 time period, but I don’t know if this wood structural support dates to that time.  The timbers are gray with age and have been heavily imbued with creosote. This is an abandoned line.
(I also don’t know who owns the two red plastic balls down on the left)