Erion Harrington has been charged with unlawful possession of a weapon by a felon; criminal damage to government property, worth between $10,000 and $100,000; and trespassing on CTA property.
Chicago police said Harrington was seen on the Roosevelt CTA platform clutching onto his waistband area, appearing to be concealing a firearm, just before 1:10 a.m. in the 1100-block of South State Street.
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He tried to flee on foot but was apprehended by the Public Transportation Tactical Team, CPD said.
A weapon was recovered, according to Chicago police.
He's next due in court Monday.