The Labour Court has recommended a 7.5% pay increase
The result of a ballot of Irish Rail staff is due later.
They are voting on a Labour Court recommendation that aims to settle the pay dispute at the company.
The ruling recommended a 7.5% pay increase over three years.
This would translate to an increase of 2.5% each year.
These would come into effect on December 1st 2017, December 1st 2018 and December 1st 2019.
It is also recommended that staff receive a once-off €500 voucher before the end of the year.
The Labour Court intervention followed a series of 24 hour rail strikes. However future strike days planned were suspended in order to ballot members on the deal.
Workers had wanted a pay rise of 3.75% a year for the next three years, but management said that is not sustainable.
They offered a 1.75% rise this year and negotiations on any further increases.
Union sources say they are expecting a positive result.
Additional reporting: Tom Swift