A 28-year-old man was on the train just after 10:30 p.m. near 47th Street when three male suspects robbed him at gunpoint, Chicago police said.
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They took his iPhone and left the train, according to CPD.
The man stayed on the train until the Roosevelt station, where he called for help.
SEE MORE: River North robbery: 2 men beaten, robbed on train near Grand and State Red Line stop
He was taken to Mercy Hospital for observation, but was not injured in the incident, Chicago police said.
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There is no one in custody, and Area One detectives are investigating.
RELATED: River North shooting: Shots fired outside Red Line station after teen fatally shot
Chicago police said Wednesday they are dedicating a team of detectives to investigate crime on the CTA after a series of recent, violent incidents along the Red Line.