From midnight until 4 a.m., inbound passengers headed downtown from O'Hare will have to take a shuttle bus from the airport to the Rosemont stop where they can catch blue line trains.
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The CTA says this change allows additional cleaning of trains at the O'Hare station and will be in effect until further notice.
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Outbound service into the airport will not be affected, CTA officials say.
For more information on train schedule changes, visit the CTA website.