Irish Rail staff with SIPTU and the NBRU have accepted a pay deal recommended by the Labour Court.
It allows for a 7.5% pay hike for workers over three years.
Workers will also receive a once-off voucher worth €500 before Christmas this year.
The Labour Court had intervened in the pay dispute following a series of 24-hour rail strikes.
NBRU members at Irish Rail backed the proposals by 69%, while 75% of SIPTU members supported the deal.
In a statement, the NBRU says it will now concentrate on ensuring that members in Bus Éireann also receive a pay award.
NBRU General Secretary Dermot O'Leary said: "Our members have made a mature and pragmatic decision in accepting this pay award after ten years of pay stagnation."
He added: "The third party industrial relations institutions of the State, both the WRC and the Labour Court have demonstrated that their independence is fundamental in disputes of this nature."
