WTTW | Chicago's PBS Station on Instagram: "The Chicago Transit Authority brought out the oldest trains in its vintage fleet Wednesday to celebrate the agency’s 78th anniversary. The CTA, created by state legislation, began operating on Oct. 1, 1947, after it acquired the properties of the Chicago Rapid Transit Company and the Chicago Surface Lines, according to the agency’s website. The 4000-series rail cars that commuters and train enthusiasts rode through the Loop around noon Wednesday were b