A 25-year-old man told Chicago police that he was on the elevator at the station at about 12:41 a.m. when four male suspects got on with him and took his property at knifepoint.
The man said he was struck in the face as the suspects took his backpack, which contained his wallet and other miscellaneous items.
Police said the suspects fled on a northbound Red Line train. Four people were taken into custody for questioning at the Clark and Division stop.
Wednesday afternoon, police announced charges against 28-year-old Robin Linzy and a 16-year-old boy.
The victim refused medical treatment at the scene.