CTAk

CTAk, also known as the Chicago Transit Authority, is the public transportation operator serving the city of Chicago and its surrounding suburbs in Illinois. It operates a comprehensive network of buses and trains, collectively known as the 'L' system, providing a vital service to millions of residents and visitors. The CTA 'L' system is one of the oldest and largest rapid transit systems in the United States, featuring a distinctive elevated track structure in many areas, which gives it its nickname.

The CTA operates 8 rapid transit lines, identified by color, that cover a significant portion of the metropolitan area. These lines connect major attractions, business districts, residential neighborhoods, and both O'Hare International Airport and Midway International Airport. In addition to its rail service, the CTA operates a vast bus network, with routes reaching virtually every corner of its service area. This combined system offers extensive coverage and serves as a primary mode of transportation for many Chicagoans.

Established in 1947, the CTA has undergone numerous expansions and modernizations throughout its history. It plays a crucial role in the economic and social fabric of Chicago, facilitating daily commutes, reducing traffic congestion, and promoting environmental sustainability. The agency is governed by a board appointed by the Governor of Illinois and the Mayor of Chicago.