Many are linked to drunk and disorderly behaviour.
Irish Rail received complaints of racism, verbal sexual harassment, assaults and drug-taking on trains last year.
There was a 60% increase in anti-social behaviour complaints in 2022, compared to the previous year.
Irish Rail received 444 antisocial behaviour complaints last year - up from 277 the previous year.
Those relating to the Dublin to Belfast and Dublin to Cork lines have been released under the Freedom of Information Act.
A woman and her husband on the Belfast line said a group of seven or eight drunken youths shouted sectarian, sexual and racial slurs on their journey.
A passenger on the Cork train claims a person took out a white substance and snorted it right off the table.
A couple claims they were subjected to verbal abuse and threats of violence from a group of sports fans.
Another passenger claims they were verbally sexually harassed by two drunk men.
One person say they witnessed a woman screaming in a man's face, threatening to kill him.
One passenger says they were kicked in the head by a man as they sat on the floor between two carriages.
Irish Rail says it has been working with the gardai, private security staff and employees to address anti-social behaviour.
It says it's a societal issue that it's not immune to.