Police are searching for a man accused of attacking a 31-year-old with autism on a suburban train.

It’s believed the attack happened between Ringwood and Lilydale stations at about 7.30am on Friday, September 23.

The man told the victim to shut up before throwing him on the ground, punching and kicking him before getting off the train.

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Police have released images of a man they would like to speak to in relation to the incident.

Anyone with information that can assist investigators is urged to contact Crime Stoppers on 1800 333 000.