The suspects remain at large.
The 35-year-old victim was on his way to work when he was robbed and punched.
The Evanston man was on a Red Line train at 10 E. Chicago Ave. when five suspects attacked him, according to police News Affairs Officer Laura Kubiak.
A female suspect took the man's iPod and when he tried to grab it back from her, he was "blocked" by other suspects and then punched in the mouth, Kubiak said. Cash was also taken from the victim, who was bruised but was not taken to a hospital.
The suspects are four men and a woman, all between the ages of 15 and 25, Kubiak said.
The victim told police he saw the suspects "harassing other people" on the train, according to the officer, who said the suspects fled and were not in custody as of 11 a.m.
It was not immediately known if this incident was connected to any other similar robberies in the same area, including the similar incident on the Brown Line Wednesday. One victim was hospitalized in that attack, in which a wallet and an iPhone were taken.
The Sun-Times Media Wire contributed to this report.