British Transport Police have released CCTV images of a man they want to speak to in connection an assault on a train which happened last year.
A 23-year-old man was attacked on the 9.40pm Helensburgh to Edinburgh Waverley train on December 7 last year.
During the journey, he was assaulted and had sectarian insults shouted at him.
The attacker got off the train at Livingston North station.
DC Donna Davanna said: “I am appealing to anyone who recognises the man in the photograph to contact me as a matter of urgency.”
Anyone with information is asked to contact British Transport Police on 08000 40 50 40 or through Crimestoppers 0800 555 111.