A “very rare” situation has unravelled in Melbourne as police struggle to identify a man who had been hit by a train several weeks ago.

Officers are calling to the public to help identify a man who has been hospitalised for over a month after becoming critically injured when he was hit by a train between Royal Park and Jewell railway stations in Brunswick at 6:33 pm on the 7th of July.

The victim is believed to be around 65 to 75 years-old and was rushed to hospital at the time of the incident with life threatening head injuries. He remains in a serious condition.

Authorities have been unable to identify him despite “extensive enquiries.” He had no phone, wallet or cards on him at the time he was hit.

He was non-communicative but was able to mumble the names “Roy”, “Ryan” and “Coburg”. It was unclear whether he was referring to himself or somebody he knows.

Police have door knocked, checked the missing persons databases, checked his DNA and even checked in with local homeless shelters.

It is possible the man is from overseas, police have released a facial composite image in hopes he is recognised.

He is described as Caucasian, 175cm tall and of medium build. He has a prominent mole below his left eye and no identifying scars or tattoos. At the time of the accident he was wearing black runners with white soles, black soles and a black belt.

If you recognise the man or know anything about his identity, please contact police or crime stoppers on 1800 333 000.

Image: Victoria Police