Links marked with S or T include historical information on lost passenger Stations and interlocking Towers. Beyond the Chicago area, information on towers serving multiple railroads is generally not duplicated among branch lines.

Former Rock Island Line

Rock Island District (Chicago to Joliet) ST
Rock Island District (Beverly Branch) T

Former Wabash Railroad/Norfolk & Western Railway

Southwest Sub District (Chicago to 74th Street) ST
Southwest Sub District (74th Street to Manhattan) ST

Former Illinois Central Railroad

Electric District (Chicago to University Park) ST
Electric District (South Chicago Branch) ST
Electric District (Blue Island Branch) T