The neat thing about Tunkhannock is that it either inspired (or was inspired by) many railroads shorter, lower bridges/viaducts in very similar styles. I've seen numerous bridges that have the same styling as Tunkhannock, albeit on a much smaller scale.
So if you make Tunkhannock, you can probably scale down one or two spans and have bridges that work on other routes.
For example, on the Illinois Central:
http://bridgehunter.com/il/jackson/big-muddy-icrr/The small upper arches aren't as high, but the Big Muddy and Tunkhannock obviously share a common ancestry (right down to the decaying concrete :)