CSX - Ashepoo River Bridge
Scherzer type
Photo taken by Douglas Butler in April 2013
BH Photo #283651
Website makes no mention of creative commons, ergo they're copyrighted.
Good news though, the site's frontpage has a link to the person's email so you can ask about usage: http://www.semanchuk.com/
Listed in TT 2 Oct 27, 1957 as "straight railed, bolted up, open only on advance notice"