Services at Bus Éireann are at a standstill due to an indefinite strike by workers.
The action is as a result of a dispute over management's decision to implement cost-cutting measures without union agreement.
Rail services are not affected by the action.
In a statement this morning, Iarnród Éireann has advised passengers that all services are operating on all routes today.
Some Intercity services were affected by the dispute yesterday due to picketing.
The strike represents a serious escalation of the Bus Éireann row, which could push the company over the edge.
It lost €9.4m last year and a further €50,000 a day in January. Each strike day will cost another half a million, which the company insists is unsustainable.
Management has said that it had to proceed with unilateral implementation of cuts due to the financial crisis, and because unions would not agree to any reductions in take-home pay or unnecessary overtime.
However, the unions have accused the company of seeking to introduce so-called yellow-pack terms and conditions in a race to the bottom, to groom the company for privatisation.
All rail services are operating on all routes today - no disruption arising from Bus Eireann dispute— Iarnród Éireann (@IrishRail) March 25, 2017