CTA deploys new 7000-series railcars on the Blue Line in Chicago, US April 22, 2021 | North America News The Chicago Transit Authority (CTA) has deployed 7000-series railcars manufactured by CRRC Sifang America on the Blue Line, which operates between Forest Park and O’Hare International Airport. C... This content is available to only subscribers. Username or E-mail Password Remember Me Forgot Password