Chicago
The Chicago Transit Authority (CTA) controls public transportation in the city of Chicago. The CTA controls a large group of buses and a fast transit elevated and subway system known as the 'L' (for "elevated"), with lines shown by colors. Rapid transit lines go to Midway and O'Hare Airports. The CTA's rail lines have the Red Line, Blue Line, Green Line, Orange Line, Brown Line, Purple Line, Pink Line, and Yellow Line. The Red and Blue lines have 24‑hour service.