There were 1,024 reports of anti-social behaviour made to Irish Rail in 2019- double the figure from 2016.
It is the first time more than 1,000 complaints were made in a 12 month period.
According to today's Irish Examiner, 338 reports were about the consumption of alcohol or drugs.
247 reports were about aggressive behaviour while 7 were about lewd behaviour.
Irish Rail spokesperson Barry Kenny says passengers are reporting incidents more frequently.
He said, "There is greater awareness, and we believe there is more reporting of incidents that would have gone unreported before."
But Mr Kenny says the rise in the number of complaints of anti-social behaviour is actually a good thing.
He said, "If we know the scale of the issue, we can obviously handle it better."
There were 56 reports of fighting on board, 77 of boisterous behaviour and there were 72 reports of the false activation of a passenger alarm.