Service on the Yellow line has been temporarily suspended due to a derailment near Dempster Street in Skokie, CTA announced.
Two employees on the train are asking for medical attention, though the extent of their injuries was not immediately known. No customers were on the train, according to CTA.
Passengers have been asked to take the #97 Skokie bus.
It is not clear if the incident will effect service for Friday's morning rush.
Check back for updates in this breaking news story.