Luas light rail services in Dublin are shut for a second day by a strike involving employees belonging to SIPTU.
90,000 people who would normally rely on the Luas each day have been forced to make alternative travel arrangements.
Another two-day strike is scheduled for next Thursday and Friday.
Further industrial action has not been ruled out.
The Luas employees are seeking pay rises of up to 53% which have been ruled out by Luas operator Transdev as unsustainable.
The financial stakes of the dispute are rising by the day for both sides.
Because of their industrial action, Luas employees have lost an annual 6.5% bonus worth up to €3,000 per worker.
In addition, they will lose at least four days pay, which could be the equivalent of a further 2% cut in their annual pay.
While Luas operator Transdev will make savings on payroll during the dispute, it will be fined approximately €100,000 a day by the National Transport Authority for failing to deliver the service.
It is also suffering significant reputational damage.
The dispute has already been to both the Workplace Relations Commission and the Labour Court without securing a resolution.
There are no indications that either industrial relations body is prepared to intervene in a bid to break the deadline, as the two sides are viewed as being too far apart for successful negotiations at this point.
Informed sources confirmed that the Luas employees are meeting later to review this week's strike, and to prepare for next week.
They said further industrial action may be considered at that meeting.