IC's Bridge over Rock River in Rockford, IL

Laird Barber posted as part of a collection
ICG GP-10 #8268 leads a manifest freight eastbound
 over the Rock River in Rockford, IL. November, 1977.

(Bridge Hunter, 3D Satellite)
Laird also has a Flickr Photo of an Amtrak train on the bridge. According to an album title, Amtrak ran a train on this route between 1974 and 1981.