Police are searching for 20 "rowdy" football fans who subjected fellow rail passengers to sectarian chanting between Dundee and Stirling.
The group boarded the train at about 19:00 on Sunday, after Celtic's 1-0 victory over Dundee United.
British Transport Police said the football supporters had also jumped on seats and banged windows while sitting in a rear carriage.
The train involved was the 15:27 service from Inverness to Glasgow.
PC Lorraine Lowe, who is in charge of the inquiry, said: "Passengers and rail staff have the right to travel without the fear of encountering anti-social behaviour of this kind.
"I am anxious to speak with anyone who travelled on this train and has information regarding the identity of those involved."
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