Chicago Tunnel Company Railroad
- Railroad historical society devoted to the history, both past and present, of the Chicago Tunnel Company, which operated 60 miles of 2 foot gauge railroad under the city's streets until 1959. Photos, history overview and FAQs provided.
- http://www.ameritech.net/users/chicagotunnel/tunnel1.html

Shore Line Interurban Historical Society
- A railfan group interested in the electric railways of the area, including the North Shore Line, South Shore Line, Great Third Rail, the "L", and the Chicago Surface Lines. Events calendar, photo galleries, merchandise reviews and membership ben
- http://www.shore-line.org/

National Railway History Society (NRHS), Chicago Chapter
- Seeks to preserve and honor trains and railroads equipment and pioneers. Provides a meeting calendar with videos and slides, member anniversaries, and links to related interests.
- http://www.chicagonrhs.com/

Chicago Electric Railfans Association (CERA)
- Focused on electric transport, from streetcars (light rail), to rapid transit, to mainline electrification. Showcases upcoming events, activity reports, resources and links.
- http://www.cera-chicago.org/