South Side Elevated Railroad

CTA - Chicago 'L' (Cook County, Illinois)
Built in stages 1892 to 2021. CTA created October 1, 1947 by combining all previous rapid transit lines.
Viaduct and tunnel system across entire City of Chicago on Chicago Transit Authority
Open to traffic

CTA Green Line/IC Overpass (Cook County, Illinois)
Opened April 23, 1892; Closed March 4, 1982; Removed 1984
Lost Pennsylvania through truss bridge over Illinois Central Railroad on Chicago Transit Authority Green Line
Removed

CTA Stockyards Line - Racine Station Bridge (Cook County, Illinois)
Built 1908
Lost Pratt through truss bridge over Racine Avenue on Chicago Transit Authority
Removed but not replaced

CTA Stockyards Line/CWI Overpass (Cook County, Illinois)
Built 1907; Removed 1957
Lost Through truss bridge over Chicago & Western Indiana Railroad on Chicagoo Transit Authority
Removed