Today is the last chance for Irish Rail to put a pay deal on the table before unions ballot for industrial action, according to Siptu.
Siptu, who represent 2,000 workers at the company, say there's been no progress on talks with Iarnrod Eireann at the Workplace Relations Commission (WRC).
Unions and management will return to the WRC this morning with workers looking for an almost 4 per cent pay increase.
Divisional organiser with Siptu Paul Cullen says progress has to be made today.
"We've held a number of meetings at the WRC and to date the company have been posturing in relation to organisational change," he said.
"Unless a pay offer is on the table today, as I've said this is the last opportunity to deal with that, we will then seek a mandate from our membership in relation to a dispute, either industrial action or strike action."