Photo: vicpolicenews

Investigators have been told a female boarded the train at Oakleigh Railway Station and a man masturbated in front of her on 26 March at 4.40pm.

The man then got off the train at Murrumbeena Railway station.

The same man boarded a train at Huntingdale Railway Station and masturbated in front of another female passenger on 23 May at 4.50pm.

The man again exited at Murrumbeena railway station.

The man is perceived to be of Caucasian or Southern European appearance with a thin build, black beard and was wearing a grey baseball cap, black jacket and black pants.

Investigators have released images of a man they believe may be able to assist with their enquiries.

Anyone with information is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential crime report to www.crimestoppersvic.com.au.