Iarnród Éireann expects industrial action planned for tomorrow to go ahead and has advised customers to expect significant disruption from 6am to 9am.
Representatives from Iarnród Éireann, SIPTU and the National Bus and Rail Union are continuing their talks over a dispute over payment for past productivity improvements.
The talks are taking place at the Workplace Relations Commission.
Train drivers who are members of SIPTU or the NBRU are scheduled to go on strike for three hours tomorrow.
Service, refund arrangements for planned industrial action 6-9am. https://t.co/L0nd09TkJv Talks ongoing, next update when they conclude— Iarnród Éireann (@IrishRail) November 6, 2015
Speaking on the way into negotiations at the Workplace Relations Commission, Iarnród Éireann HR Director Ciaran Masterson said the company will be working hard to bridge the gap between management and unions.
Both unions involved in the dispute have said working hours for train drivers are central to the negotiations.
SIPTU and NBRU representatives said progress is being made but their core concerns including limits to the working week for train drivers have not yet been addressed.
Going into the talks, representatives from both SIPTU and the NBRU said they could not rule out further industrial action after tomorrow if talks do not succeed.
The strike is set to disrupt the travel plans of more than 40,000 passengers.