Transit Crime Investigation Unit officers are appealing for information following reports of a sexual assault that occurred onboard a train in the Pakenham area.
Officers have been told a man followed a 16-year-old girl onto a train in Pakenham and sat across from her on the same carriage on 29 January at about 4.20pm.
He moved closer toward the victim, performed a lewd act, exposed himself and sexually assaulted her.
The victim told him to stop and moved carriages, before disembarking a short time later.
Investigators have released CCTV images of a man they believe may be able to assist with their investigation.
The man is perceived to be of Indian Sub-Continental appearance, with a shaved head, a thin build and is approximately 30 years old.
He was last seen wearing a white striped t-shirt, black hooded jumper, dark shorts, maroon knee brace on his right knee and carrying two large duffle bags.
Anyone who witnessed the incident or with information about the identity of the man is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential report at crimestoppersvic.com.au
