When British Rail staff checked the carriage of the Orpington to London Victoria train as it rolled into its final stop at 2.50pm 30 years ago, they found the body of 26-year-old Debbie Linsley.

Since the Bromley woman’s murder, more than 1,200 statements have been taken and more than 650 people have been eliminated as potential suspects.

But the investigation has led to nothing. No arrests, no convictions, no answers.

Debbie was 26 years old when she got on a train at Petts Wood on her way to Victoria on March 23, 1988.

She got into the old-fashioned train carriage with room for six people and when it rolled into platform 2 at Victoria Station, staff found her body on the floor.

Debbie was working as a hotel manager in Edinburgh but was down to visit her parents and brother Gordon in preparation for his wedding a few weeks later.

Police have their hands on DNA samples as Debbie fought off her killer during the attack, but their 30-year search for the killer has brought them nothing.

Detectives believe the murder weapon was a five to seven inch knife, although no weapon was ever recovered.

Arthur Linsley, Debbie's father, said: "My daughter was murdered 30 years ago and despite the DNA profile of the suspect being available, the person responsible has still not been found.

"I appealed in 2013 for those who had suspicions about a partner, a friend or a relative to please come forward and I renew that appeal now on this anniversary of Debbie’s death."

A/DI Susan Stansfield is leading the investigation with the Met’s Special Casework Investigation Team and she said: “It has been 30 years since Debbie was tragically murdered, but our efforts to trace the perpetrator continue. We will do everything in our power to identify the killer and bring them to justice.

"We have a DNA profile of the suspect and this remains a key piece of evidence that we are following up on. As well as the physical evidence at our disposal, we would be keen to hear from anyone who has information that might assist the inquiry.

“Have you had an unusual, out-of-the-blue conversation with someone about the murder in the intervening years? Has someone confided in you with information only the killer would know?

"Although this happened 30 years ago, you may recall being on that train or at a station on the route and seeing something which at the time you thought nothing of but in light of what happened was out of place and suspicious, and might be significant."

Anyone with information is asked to call 020 7230 4294 or Crimestoppers anonymously on 0800 555 111.