Police are hunting a group of 10 men dressed as golfers who subjected a family to a “barrage of abuse and vile language” on a train between Cardiff and Bridgend.
The incident took place on board on a First Great Western train between 8.50pm and 9.14pm on May 18.
British Transport Police have now released CCTV pictures of the 10 men they wish to speak to.
Investigating officer Sergeant Nick Brown said: “Three women were travelling home from a weekend away in London when a group of men, all aged in their early 20s, boarded the service at Cardiff Central.
“As soon as they entered the carriage, the men – all of whom appeared to be drunk – became abusive and were shouting loudly.
“When challenged over their behaviour and asked to mind their language, the men subjected all three victims to a barrage of abuse and vile language.”
All of the men got off the train at Bridgend.
“I am very keen to trace these men as we believe they may all have information which could assist the investigation,” said Sgt Brown.
“This was an extremely distressing and intimidating experience for the victims, who were three generations of the same family simply making their way home after what had been a pleasant weekend away.
“Passengers and staff have the right to go about their business without being subjected to abusive behaviour of this type.
“I would like to appeal to the public to come forward with any information they may have in relation to this incident, and particularly anyone who recognises the men in the CCTV images.”