Victoria Police are investing an alleged act of indecent exposure reported to have occurred last month.
According to the police, a female passenger who boarded a train at Aircraft Railway Station at about 12.30 pm observed a man indecently exposing himself.
The alleged offender had also boarded the train Aircraft station.
The incident is alleged to have taken place on the Werribee train line on Friday, January 12.
The man got off at the train at Flinders Street Railway Station at about 1 pm.
Investigators have released images of a man they wish to speak with in relation to the incident.
Anyone with information is urged to contact Crime Stoppers on 1800 333 000
