Talks aimed at averting a strike at Bus Eireann are continuing at the Labour Relations Commission in Dublin.
Management at the company and trade union officials have been locked in discussions since 10am this morning.
A draft document from Bus Eireann outlining a revised set of cost-saving proposals will be presented to unions at 5pm.
SIPTU's Willie Noone said he is hopeful a deal can be reached.
SIPTU has said strike action will go ahead as planned if there is no positive outcome from talks with Bus Éireann management over planned cutbacks.
Bus Eireann announced in early December its intention to unilaterly implement change to staff terms and conditions after trade unions rejected a €9m cost-saving plan.
The company wants to reduce overtime rates, increase the working week for some staff, reduce shift, premium and rota payments, and cut annual leave by three days, with effect from this Sunday.
Members of the National Bus and Rail Union say their action will commence on Sunday, while SIPTU and the TSSA plan to mount pickets next Thursday.