Officials say one of the passengers in Tuesday's derailment has been treated for minor injuries.
Chicago Transit Authority spokeswoman Sheila Gregory says all 14 passengers were able to walk to the platform of a nearby station.
The derailment happened while the southbound Red Line train was on ground-level tracks. All four cars remained upright.
The Tuesday morning accident comes just one week after a Green Line train derailment injured 14 people.
