Police are appealing for information after an alleged act of indecency committed on a train.
About 9.15pm on Monday, March 26, while travelling between Wolli Creek and Glenfield Railway Stations, a man allegedly committed an act of indecency.
The man boarded another train and allegedly committed another act of indecency, before departing at Leppington Railway Station.
Officers from the Police Transport Command received reports and commenced an investigation.
As inquiries continue, police have released an image of a man they believe may be able to assist them with their inquiries.
The man is described as being of medium build, aged in his 20s, with a goatee beard.
He was last seen wearing a grey t-shirt, black tracksuit pants with a hooded jumper tied around his waist and a dark coloured cap on backwards.
Anyone with information or that can identify the man is urged to contact police via Crime Stoppers on 1800 333 000.