We’re a little more than 77.5 miles south of Elkhorn City at Clinchport tunnel, actually near Boulder VA.  The railroad here crosses SR 644 on a 1929 overpass (shown).  Tunnel is at 36.671713, -82.745216 and is 637′ long.  The first picture is looking south and the second picture is looking north with the lintel of the tunnel clearly showing the 1913 date.  This was two years before the Clinchfield Railroad was officially completed.