Police have not identified the suspect but say he is facing charges of indecent assault and other related offenses.
The man is accused of following a woman from the City Hall subway station to Tasker-Morris where he allegedly groped a woman Monday evening.
"He approaches her stands over top of her and without saying a word, grabs her breast," said Lt. John Hewitt.
Police say the suspect is then seen walking around on the platform until he finds his next victim, about 15 minutes later.
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"He asks her for a cigarette, she gives him the cigarette she was smoking he then asks her for a kiss. She declines, he grabs her around the waist, pulls her towards him and then gropes her," said Hewitt.
There have been 154 reported indecent assaults on SEPTA so far this year. Riders say they're concerned by the random attacks.
"It could have been me or anybody, you know," said Taylor Williams of South Philadelphia. "I get timid especially at night because it gets dark and there's barely people down there."
Police say it's important to report these types of crimes.
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"Our second victim didn't report the incident until the following night. She went home and thought about it didn't want another person to be victimized in the same fashion," said Lt. Hewitt.
By reporting incidents, investigators can trace a possible pattern, and work to prevent more assaults.