British Transport Police are seeking the identities of two men and a woman who they believe could help them after a 20year-old man from Edinburgh was threatened and robbed on a train travelling between Kirkcaldy and Burntisland earlier this year.
The incident occurred at about 9.40pm on April 15 on the 20.41 Dundee to Edinburgh Waverley service.
The trio got off the train at Burntisland station.
Detective Constable Derek Alexander said: “I am appealing to anyone who recognises those in the photograph to contact me as a matter of urgency.”
Anyone with information should contact British Transport Police on 0800 405040 or by texting 61016 and quoting reference B of 2014.
Information can also be given anonymously to the independent charity Crimestoppers on 0800 555111.