This is the trestle coming out of Holbrook Tunnel, about 4 miles east of CoeburnVA. It’s around 490′ in length and spans Lawson Hollow. Since this N&W line went through Wise County around 1905, a trestle here probably dates to then. It’s at 36.562643, -82.233247.
Blogging the Railroad Tunnels 
Great shot. Looks very similar to the old Virginian trestlel over I-77 near Princeton
How many tunnels are there between Knoxville and Harrogate on the R.J. Corman line? On Google, it appears there are three or four.