POLICE are searching for a man who committed an assault on a Frankston line train on 30 August.
The man boarded the train at Bentleigh and assaulted a 19 year old male passenger who asked him to turn down music playing from his portable speaker.
The victim boarded the train at Patterson Lakes at 2.30pm, and was verbally assaulted and punched in the back of the head.
The offender, of caucasian appearance and aged in his early 30s, got off the train at Glenhuntly.
Police urge anyone who witnessed the assault or has information to contact Crime Stoppers on 1800 333 000 or submit a confidential crime report at crimestoppersvic.com.au