Chicago police said the incident happened on a CTA train near the Kostner Pink Line station at 5:28 p.m. on Feb. 17. The group ganged up on a 49-year-old man and beat him before robbing him.

The derailment happened near 26th Street between Kostner and Cicero avenues. Video showed several train cars tipped over. SEE ALSO: Crews use ladder to rescue passengers from stalled CTA Green ...