The union has accepted an invitation to engage with the Labour Relations Commission today.
Bus Eireann is planning to introduce €9 million in cuts and workers are unhappy with the lack of consultation.
Strike action by members of the National Bus is due to take place on Sunday, while SIPTU and the TSSA plan to mount pickets next Thursday.
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SIPTU's Willie Noone says he can't understand why management have decide to leave them out of the process:
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