Irish Rail has received 105 complaints of anti-social behaviour on the Dublin-Cork line since the beginning of last year.

According to documents released under the Freedom of Information Act, many relate to drug activity on trains.

In one complaint, a passenger calls on Irish Rail to address 'junkies dealing drugs' all day outside Heuston Station.

Other complaints include two passengers going to and from the toilet taking drugs openly - and a verbal attack by someone 'out of their mind' on drink and drugs.

Another passenger claims on two Saturday evening trains, large gangs were carrying hurleys and knives - and that it is only a matter of time before someone gets badly injured or killed.

One commuter says a drunken passenger seemed to be taking ecstasy tablets on board.

Other complaints include a man 'high on drugs' shouting and roaring at a woman - and another man making death threats.

But Irish Rail's Barry Kenny says these type of incidents are rare.

"Any incidents of anti-social behaviour are a concern - but the overwhelming majority of people who travel on our services - including the Dublin-Cork route - do so without incident.

"We do have 4.5 million journeys during that timeline".

Irish Rail adds that all Dublin-Cork services have a train host on board, ensuring that customers can report issues directly.

Reporting by Eoghan Murphy