British Transport Police (BTP) have appealed for information after a group of men intimidated passengers on a train between Edinburgh and Inverkeithing on Saturday.
The incident happened on the 10:08pm train to Dundee as it left Waverley Station. As the train left Edinburgh, the men began jumping up and down, and banging the roof of the carriage. They were also said to be singing and shouting, and obstructing the luggage racks.
Passengers on the busy service, who included young children, reported feeling threatened by the actions of the men.
BTP intend to consult CCTV from both the train and the stations to identify the men.
British Transport Police can be contacted on 0800 40 50 40 or by texting 61016. Information can also be given to the independent charity Crimestoppers on 0800 555 111.