British Transport Police are looking for the six passengers who sang religiously offensive songs on board a Glasgow to Edinburgh train on Saturday.
The indcident happened as the train travelled from Glasgow Queen Street at 8pm. The six men sat in the first class compartment of the rear carriage and got off the train at Falkirk High station.
BTP officer Fiona Macaulay is appealing for anyone who was on the train or at the stations and has information which can help identify those responsible to contact her.
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.