The Chicago & Western Indiana (C&WI) Railroad Bridge is an outstanding example of a “tower-driven” vertical-lift bridge, characterized by its operating machinery mounted upon the two towers of the bridge that contain the counterweights. ...the bridge is based on the patents developed in the early 20th century by the Kansas City-based firm of Waddell and Harrington, yet is the modern counterpart to the firm’s popular “span-driven” bridges built between 1912 and 1915 in Chicago.
-Commission on Chicago Landmarks, Historic Chicago Railroad Bridges report
Warren through truss with all verticals bridge over Calumet River on abandoned Chicago & Western Indiana Railroad
Posted September 25, 2012, by Steve Conro (sconro [at] yahoo [dot] com)
Although this abandoned rail bridge is normally stored in the raised position. It appears like they're currently using it as a bypass for the Torrence Ave automobile bridge which is under going some sort of maintenance.