The collision happened around 7:40 p.m. on the Metra Electric line near 27th Street, officials said.
A 16-year-old pedestrian boy on the track for an unknown reason when they were struck by an outbound Metra Electric train, a Metra spokesperson said.
According to the Cook County Medical Examiner, the pedestrian later died.
Inbound and outbound Metra Electric trains were delayed Thursday night.
No further information was immediately available.