RAILROAD JUNCTIONS AND CROSSINGS AND TOWERS
Historic tower and interlocking information is linked from the pages covering present and past lines, including histories and operating information. Included is information on all known past and present interlockings in the Chicago area and surrounding states.
Zoomable Google Maps of the Chicago area, marked with present and past railroad junctions, crossings, and towers.
Not covered are CTA rapid transit lines, and abandoned electric interurban lines. The interurban lines are only mentioned, where a tower controlled a crossing between an interurban line and a regular "steam" railroad. Also not included are drawbridges which were not interlocked.
Also not shown are certain interlockings, often short lived, with limited histories and where the exact locations could not be verified.
From 1889 to 1913, the earliest interlockings were registered with the Railroad and Warehouse Commission of Illinois, and assigned numbers in the order of registration. The Railroad and Warehouse Commission was later succeeded by the Illinois Public Utility Commission, and now the Illinois Commerce Commission. List is from various Annual Reports of the Commission.
The earliest interlockings were registered with the Railroad Commission of Indiana, list is from the 1908 Annual Report of the Commission.
The earliest interlockings as reported by the Commissioner of Railroads, State of Michigan, and the successor, the Michigan Railroad Commission. List is from various Annual Reports of the Commission.
Chicago's Interlockings (Background)
OTHER TOWER WEB SITES
Additional Web sites about interlocking towers and movable bridges.
Much information on old interlocking towers in the built up areas in Illinois, is from the "Sanborn Fire Insurance Maps", which is a fascinating and valuable resource in determining exactly what buildings were where, historically. People with a Chicago Public Library card can access these maps online at the Chicago Public Library Web site. Additional information is from the Train Watcher's Guide To Chicago, by John Szwajkart. And historical information is from various railroad annual reports, state regulatory commission reports, and issues of Railway Age and related publications. Information is incomplete, and any further information would be appreciated. Bill Vandervoort