This gives an idea of how massively these railroad companies built when they needed to. I took this under a double track trestle over the Bluestone River- and an out-of-service single rail line- in West Virginia at 37.32335, -81.32700. Just behind me is Pocahontas Avenue north of Pocahontas VA. The trestle above is about 665’ in length.
Blogging the Railroad Tunnels 
Great photo of Pocahontas Division crossing the old Bluestone Branch at Coopers, Wv