With less than 12 hours before tomorrow's train strike, last ditch talks are continuing at the Workplace Relations Commission.
No DART, Commuter or Intercity services will run between 6am and 9am.
However, a handful of services that start before 6am will continue as normal and to schedule.
Dermot O'Leary from the NBRU says the only way to stop this action from going ahead is to listen to their concerns.
"It will take a settlement of the issues that are at the heart of this dispute which is past contributions of train drivers, and we said already we will embrace the company's agenda of future productivity.
"To us it's a no-brainer if you've embraced past productivity then obviously you're going to embrace future productivity but only if there is recognition first of previous contributions and past productivity."