the O'Hare-Congress-Douglas route for its three branches. The Congress and Douglas branches were renamed for their terminals, Forest Park and 54th/Cermak
continuing east on the Blue Line through the Dearborn subway to O'Hare north of the Polk station, trains run north over a section of track on Paulina Avenue
routing all but 12 trains per day coming from O'Hare to Forest Park and adding entirely new service from the 54th/Cermak terminal in Cicero to The Loop via
the Red line. In 2014, the O'Harestation train crash occurred when a Blue Line train overran a bumper at the airport station and ascended up an escalator