An unidentified man - believed to be using an alias - was struck and killed by a train in Sydney's inner west more than 40 years ago.
He died on the tracks between Stanmore and Newtown stations on the afternoon of April 14, 1981.
On Wednesday, more than 40 years later, police released a computerised image and a photo of the man's distinctive tattoos in the hope of identifying him.
Following a 2021 review of cold cases, a fingerprint analyst identified the man as possibly being Osvaldo Perez, born in 1955 and living in a boarding house in Fairfield East.
The then-25-year-old was believed to be employed as either a labourer or boilermaker.
But detailed investigations in Australia and abroad have failed to establish that any such person existed.
While there are no suspicious circumstances surrounding the death, police have been unable to identify the man and notify his family.
He was arrested by Cabramatta police on New Year's Day in 1981 for drink driving, but investigators believe he gave false details at the time.
Detective Inspector Ben Kennis said police thought the man might have arrived in Australia from Spain or Greece, but there was no record of him ever entering or leaving the country.
Retired inspector George Georgiou said he had been troubled by the cold case since the file landed on his desk as a young constable.
"I vividly remember going to Newtown railway station on the day of his death and speaking to a number of people on the platform who noticed him," he said.
"He was very, very nervous, very irrational, speaking to himself and then all of a sudden, he just slipped in front of the train."
Mr Georgiou said he did everything possible to try to identify the man.
"He had no identification, not a driver's licence or healthcare card or anything," he said.
The man was never reported missing and given a pauper's funeral attended by only Mr Georgiou and cemetery staff.
"How sad it would be that he was given a pauper's funeral ... and just given a number," the ex-inspector said.
"I'd hate that being one of my relatives.
Tattoo artists are also helping detectives in a bid to identify the unknown man.
On his left thigh, he had a tattoo of a woman wearing a bikini and holding a bunch of flowers, as well as an eye and the words "Eulrlia" and "Stevios".
The origin of these words could possibly be either Greek or Spanish.
He also had a rose on his left shoulder blade.
The man was described as being of Latino appearance, 176cm tall, aged between 25 and 30, of medium build, olive complexion, with black curly collar-length hair, a black moustache and speaking with an accent.
It is believed the man may have had links to Fairfield's Romanian community.
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