The man was on the train about 3:30 a.m. near the Chicago station when someone walked up to him, hit him on the head with a bottle and stole his wallet and money, according to CPD.
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The man suffered a cut on top of his head and was taken to Northwestern Memorial Hospital in good condition.
RELATED: South Loop safety meeting zeros in on CTA crime, which is up compared to last year
No one is in custody, and Area Three detectives are investigating.
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Chicago police did not immediately provide any information about a possible suspect.
CTA riders and South Loop residents held a meeting last week to express their concern about an increase in crime on the transit system so far this year.