Police said a male person of an unknown age was struck by a CTA Blue Line train in the 400 block of South Damen Avenue at about 4 a.m. The Chicago Fire Department pronounced the victim, who was severed in his mid-body, dead on the scene.
Area Three detectives are conducting a death investigation.
CTA said Blue Line service was temporarily suspended between Pulaski and LaSalle due to a police investigation. Service has since resumed with delays.
Police did not immediately provide further information.