According to the Chicago Fire Department, one wheel on a Purple Line train went off the tracks just after 6 p.m.
Firefighters were seen helping the 24 passengers on board safely disembark the train. No injuries were reported.
Red Line train service was shut down for several hours between Howard and Belmont. Purple Line Express service was also suspended, though local Purple Line trains continued running between Howard and Linden.
Shuttle buses were made available between Belmont and Howard while crews worked to restore service.