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Welcome to Chicago "L".org, the internet's largest resource for information on Chicago's rapid transit system!

What's New

Latest Update: July 26, 2026 Added the new Infrastruture section, which will focus on the physical structures and systems that support the "L", such as the elevated track structure, signals, and more. The Infrastruture section launches with two articles about the design and early modifications of the early steel "L" structures -- Above All, there is the "L"!: Appreciating its Structure and The Structure Adapts to Changing Conditions -- by Stan Kaderbek, respected structural engineer, former CTA engineer, and former Deputy Commissioner/Chief Engineer for CDOT Bureau of Bridges and Transit and First Deputy Commissioner and Commissioner of Buildings for City of Chicago; and Art Peterson, renowned transit historian, engineer, and transit professional with broad experience in the operating, planning and engineering sectors of bus and rail. . Forest Park Lake line station profile updated with info and 14 new images. Added new Maple Met station profile. Lombard Garfield Park line station profile updated with info and 1 new image.

Additional Information

Historic Station Tours: The Chicago Architecture Center and the Chicago History Museum provide tours of Chicago's historic rapid transit system, visiting several of Chicago's oldest, most unique, and most architecturally interesting rapid transit facilities, with tours and lectures given at each site. Section also includes information and photos from Chicago-L.org's past tours. Mishaps and Unusual Occurrences: Described here are some of the accidents, mishaps, and uncustomary circumstances that have befallen the "L". Frequently Asked Questions: A compilation of common queries. Vocabulary of the "L": Learn an automatic train signal from a "fool catcher" with our list of vocabulary words and phrases. Posters and Advertisements: Check out 1920s CRT posters advertising the sights and scenes that Chicagoans could see by taking the elevated and other ads.

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