A four-car Chicago Transit Authority train derailed on a South Side track Wednesday, forcing emergency responders to retrieve dazed passengers from the elevated structure, but there were no immediate reports of serious injuries.

The southbound train's first two cars sat askew at a junction between two lines but remained upright after the derailment, which CTA spokeswoman Catherine Hosinski said happened shortly after 10 a.m.

All passengers appeared to be off the train within about an hour. At least 10 people were taken to hospitals with non-life-threatening injuries while others refused treatment for minor injuries, according to Fire Department spokesman Larry Langford.

Emergency crews assessed more than 20 people at the scene, according to the department.

Renee Davis said her sister, Mary Ann Baker, was on the train and called from her cell phone shortly after the derailment. Davis said she could hear other passengers "hollering, screaming, praying."

"She said it just spin around, it just tipped," Davis said of her sister. "She hit her head, her whole body."

Charles Holland, a spokesman for St. Bernard Hospital and Health Care Center, said the facility had received two patients — both of whom were reported in stable condition.

Wednesday's derailment was just the latest problem for the city's deteriorating century-old train system, which runs throughout the city and to nearby communities on elevated and underground tracks.

Last month, a Red Line train derailed as it pulled into a station on the Chicago-Evanston border. A week earlier, an electrical problem caused a Blue Line train to stall in a subway, forcing the evacuation of up to 100 passengers and shutting down service between downtown and O'Hare International Airport. Seven people were taken to hospitals with non-life-threatening injuries.

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