Police are hunting for a man who abused train passengers and threw mobile phones around a carriage.
British Transport Police appealed for information after the incident, which happened between Aberdeen and Montrose on Saturday.
The man, aged in his late 30s to early 40s, shouted and swore at other passengers on the 10.27pm Aberdeen to Dundee service.
He also threw two mobile phones in the rear carriage before getting off at Montrose shortly after 11pm.
Investigating officer PC Craig Allan said the man was believed to be drunk.
He said: “The behaviour is not acceptable and others on the train shouldn’t be forced to tolerate it on their journey.
“I am asking anyone who can provide information which can help identify him to get in touch.”
The man was described slim build with short dark hair, and spoke with a local accent.
He was wearing a short dark green jacket, blue jeans, and light brown boots
Officers are reviewing CCTV in an attempt to identify him.