Clashes between Tyrone and Armagh GAA fans on the Dublin to Belfast Enterprise train are being investigated by Translink.
It happened on the 20:50 train on Saturday, after Tyrone beat Armagh in the All-Ireland SFC quarter-finals at Croke Park in Dublin.
Gardaí were called and boarded the train at Drogheda at about 22:20 local time. No arrests were made.
Translink said “some passengers were involved in an affray on board”.
A gardai spokesperson said: “Irish Rail staff contacted gardaí at Drogheda Garda Station to inform them that there was a disturbance on board a Belfast-bound train,” a garda spokesperson added.
“Gardaí arrived on the scene and boarded the train. They spoke to a number of passengers and calmed the situation down. No complaints were made and no arrests took place. The train departed a short time later without further incident.”
Translink said that gardaí were called after a train manager raised concerns. ”The train stopped at Drogheda to allow them (gardaí) to board and deal with the situation,” a Translink spokesperson said.