Police are hoping an artist's impression will help them identify a man whose body was found by rail lines in Essex a decade ago.
The man was found dead from hypothermia beside a track in Southend on 15 November 2000.
British Transport Police said it believed the man and 19 others found near train tracks in the UK in the past 35 years were not killed deliberately.
BTP hopes the sketches will help close the files on the 20 fatalities.
Detective Ch Supt Miles Flood said: "It is likely there are still relatives who may recognise them and thought they had moved away."
Advances in forensics
The man found in Southend was described as black, about 5ft 8in (1.70m) tall with receding black hair and a grey beard.
He was wearing a green jacket, brown trousers and white Tommy Hilfiger trainers.
He may have been a some who travelled around, with links to Waterloo, police said.
Mr Flood, from British Transport Police, said: "All these fatalities were fully investigated at the time and all clues followed up to try to establish an identity, but without success.
"We are now taking another look to see if there is any more we can do, in some cases to see if advances in forensic techniques can help, and to appeal to the public to see if anyone recognises them.
"Some of these people may have had an itinerant lifestyle but it is likely that there are still relatives or friends who may recognise them and thought they had simply moved away."
Anyone with information should contact British Transport Police.