British Transport Police is appealing for information after a group of five men shouted and sang songs of a religiously offensive nature on an Oban-bound train on Saturday.
The incident happened on the service which left Glasgow Queen Street at 4.37pm.
The men are all described as being in their late-30s. One had a shaved head, another was wearing a white T-shirt and one of them had a moustache.
Constable Stephanie Crawford, the officer in charge of the inquiry, said: “It is reported that the men had been drinking throughout the journey and as the train neared Oban they were shouting and singing the offensive songs.
“This sort of behaviour is not acceptable and other passengers should not be forced to tolerate it during a train journey. I am appealing for anyone who was on the train and can provide information which can help identify the men responsible to contact BTP as a matter of urgency.”
British Transport Police can be contacted on 0800 40 50 40 or by texting 61016 – quoting reference B3 of 31/08/2015. Information can also be given anonymously to Crimestoppers on 0800 555 111.
