This line from New Castle to Indy was known as the Honeybee Line, and this bridge is still commonly referred to by that name. An old powerhouse for the line stood nearby until about 1970.
I'm going to make an attempt to get some pics when the leaves are down. It is gated on the one end but I think I may know a way to access it.
If not, one of the images in that thread is from the Electric Railway Journal, and is likely in the public domain.
There are photos of the bridge at http://indianarailroads.org/board/index.php?topic=15003.0 . If I am lucky maybe I can get the photographer to post them here.