Bus Eireann school drivers are to hold a vote on if to join a strike over cuts at the company.
This morning, there was travel chaos across Dublin as staff from Dublin Bus and Irish Rail took part in unannounced action.
It's expected all services - bar Bus Eireann - will run as normal this evening, but traffic may be heavier as more people drove in earlier.
Almost all trains and buses in the city were cancelled in what's been described as an unprecedented 'illegal secondary picketing'.
For more updates, see Irish Rail's Twitter account.
Meanwhile, Dublin Bus say pickets have been lifted at their pickets as well but their services are likely to be delayed for some time.
Dublin commuters suffered travel headaches this morning when most Dublin Bus and Irish Rail services ground to a halt.
At around 4am today, management in both Irish Rail and Dublin Bus woke up to discover striking Bus Eireann drivers had planted themselves outside their depots.
This action has been condemned by Dermot O'Leary of the NBRU.
"I've issued notices ... explaining to people in Dublin Bus and in Irish Rail that they have no issue with their employers. I understand the frustration of Bus Eireann workers but I can't condone it".
The Transport Minister also criticised what he calls the "unnoficial and unjustified protest" and says he is monitoring developments.
Workers now say they've made their point but Bus Eireann drivers wouldn't say if this was a once off extension of the strike.