Union officials have said all major issues with Bus Éireann have been resolved after talks concluded at the Workplace Relations Commission.

Unions added that there are a number of less important issues that remain to be agreed, but it is expected the two sides will iron those out over the coming weeks.

The National Bus and Rail Union (NBRU) said: "Detailed discussions took place on many issues with a second clarification document emanating from the talks.

"The composite rate agreed in Labour Court Recommendation 21438 will be implemented on 3 December 2017.

"The NBRU aspires to deal with the underlying policy issues that caused the crisis at Bus Éireann at the Transport Forum previously agreed with Minister Ross."

Bus Éireann staff went on strike earlier this year over proposals for cost-reduction measures at the company, which at that point was losing €9.4m a year and at risk of insolvency.

Part of the deal to resolve the row involved the implementation of new, more efficient rosters.

The talks between Bus Éireann and unions to discuss the implementation of new cost-saving rosters began this morning.

The new rosters were due to be implemented on three occasions in recent weeks, but were deferred each time to facilitate today's talks.

In a statement, Bus Éireann said that the Labour Court agreement will "ensure cost savings can be achieved to address the company finances in line with our business plan, and assures our commitment to all of our customers and stakeholders at this busy time of the year".

On his way into talks, NBRU General Secretary Dermot O'Leary said there remained a threat of a ballot for industrial action over the issue.

"Despite the efforts of our representatives to engage with the company over the last number of months, they have been unable to produce rosters that would be acceptable to our members," he said.

Mr O'Leary also said there was a particular problem with rosters in the east where new services were brought in Navan.

He said bus drivers were working 13 or 14 hour days, which he said was supposed to be a temporary measure. "That's a pressure point for us at this stage," he said.