CCTV footage has been released of man who abused a train guard while travelling between Colwyn Bay and Rhyl.
British Transport Police (BTP) is appealing for help from the public in identifying the man after the incident, which happened at around 2.40pm on Friday, 30 November.
Investigating officer PC John Sharp said: “The train guard on a Holyhead to Birmingham New Street service asked a man to take his dog off the seat and place it on the floor.
“He refused to do so and immediately became abusive towards the guard, acting in a threatening manner.
“We have identified a man we would like to trace in connection with this incident. He is described as white, in his mid to late 20s, around 6ft 4in and of slim build.
"He was wearing a black tracksuit with blue trim and white trainers.”
PC Sharp added: “This was a totally unprovoked attack on a member of staff simply doing his job; he certainly did not deserve to bear the brunt of the passenger’s frustration.
"Although the victim was physically unharmed, he was extremely shaken as a result of this intimidating incident, as he genuinely believed he was about to be assaulted.
“Clearly, this man’s behaviour towards rail staff was entirely unacceptable. Staff have the right to go about their work without feeling threatened or suffering abuse of this kind.
"We've made a number of enquiries to try and identify this man, including circulating his images on police intelligence databases, but to no avail. Therefore, I would ask anyone who recognises him to come forward, as we believe he will have information which can assist the investigation.
“BTP will not tolerate assaults of any kind towards railway staff and we will do everything possible to track down the offender and bring him to justice. I would like to appeal to anyone who may have witnessed the incident or who may recognise the man pictured to contact police.”
Anyone with information should contact British Transport Police on 0800 40 50 40 quoting background reference B4/WUA of 17/01/2013. Information can also be passed to the independent charity Crimestoppers on 0800 555 111.