The National Bus and Rail Union has said industrial action will be up for discussion when they meet with SIPTU to discuss the breakdown of talks between train drivers and management at Iarnród Éireann.
Talks ended yesterday evening without agreement over the issue of past productivity, which has seen drivers increase their workload and their duties.
As part of an agreement brokered at the Labour Relations Commission in September last year, Iarnród Éireann said the issue of increased productivity could be revisited.
During talks yesterday, the NBRU said the company would not engage on this issue.
Speaking on RTÉ’s Morning Ireland, Dermot O'Leary of the NBRU said while they hope industrial action would not be necessary, he said it will be one of the items on the agenda when they meet with SIPTU next Tuesday.
Iarnród Éireann, however, has said it is not in a position to revisit an agreement on past productivity as the company is losing €1 million a month.
Speaking on the same programme, the company's Corporate Communications Manager Barry Kenny said unions representing train drivers had created unrealistic expectations.
Mr Kenny said the company is prepared to continue negotiations and that they will consider new productivity measures with a cost benefit.
He added that any industrial action could threaten the viability of the company.