Police believe two indecent assaults on women at Burswood Train Station area linked.
Two women were indecently assaulted in separate incidents involving a man believed to be in his 40s in October.
A 23-year-old woman from Munster was targeted after leaving a Perth-bound train on October 24 about 7.30am.
The man also left the train and as he did, indecently assaulted the woman.
A week later at the same time, a 34-year-old Victoria Park woman was indecently assaulted by a man who left the train with her.
Police want to speak to a man who is described as being in his 40s with olive skin, dark receding hair and dark facial hair.
Anyone with information is asked to contact Crime Stoppers on 1800 333 000.