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Chicago Metro CTA

The Chicago Transit Authority (CTA) operates the nation's second largest public transportation system--a regional transit system that serves the City of Chicago and 40 neighboring communities. CTA provides 1.64 million rides on an average weekday, accounting for over 80% of all transit trips taken in the six-county Chicago metropolitan region. The rail system consists of train lines spanning the city and neighboring communities, and is known as "The 'L'." The service provided is described as "heavy rail rapid transit," also referred to as a "subway" or "metro" in many parts of the world. Today's 'L' system has eight rapid transit routes and consists of 146 stations over approximately 224.1 miles of track. Parts of the 'L' run above ground, in subway tunnels and tubes, as well as at grade or in expressway medians. Two routes—the Red and Blue Lines—operate 24 hours, every day. The nickname 'L' is short for "elevated," a reference to the all-elevated beginnings of the system (even though, as just mentioned, parts of the system today are at or below ground).