Police are urging anyone with information surrounding a physical altercation inside a train travelling from Mandurah to Perth Tuesday, August 18 to come forward.
The incident happened around 6:25pm in the area of the Canning Bridge Station.
One man has come away with a facial injury after a fight broke out involving a number of people.
Anyone who witnessed the incident, has mobile phone footage of the altercation or has any information is asked to contact Crime Stoppers on 1800 333 000 or report online at www.crimestopperswa.gov.au.