The level of complains made in relation to anti-social behaviour on the Dublin-Westport railway line will be discussed at a meeting next week.
Details released under the Freedom of Information Act show Irish Rail received 40 complaints of antisocial behaviour on the Dublin-Westport line in 2018.
Many relate to drunken abuse caused by stag parties who were bound for Westport.
Fianna Fáil's transport spokesman, Sligo TD Marc MacSharry, says it's a matter of concern, and he will be raising the issue with the CEO of Iarnrod Eireann at a meeting next Tuesday.
Meanwhile, Irish Rail has pointed out that there were over 577,000 passenger journeys on the Dublin- Westport route last year.
The company says that, while the 40 complaints of anti-social behaviour are regrettable, it shows the vast majority of journeys occur without incident.
Irish Rail has also started introducing Customer Service Officers on board the Westport-Dublin services which will ensure that customers have a person on board the train to whom they can report concerns.