My father, Freer Milam, affectionately nick named Uncle Dix "ridge-runner" because of his adventurous nature. Uncle Dix was famous for swimming across the Ohio River and walking across the top of this railroad trestle as a boy.
The bridge was constructed in 1926 and is 2011 feet long. It carried the Pennsylvania Rail Road "Main Line" on its Panhandle Route until downgraded by Conrail.
A history of its construction and details of the bridge are here (link) .