The union has already lodged pay claims at both Bus Éireann and Dublin Bus.
They say their latest claim is justified due to a changing economy and increased passenger numbers at Irish rail.
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Luas workers are currently considering an offer by management, to end their campaign of industrial action in pursuit of a wage hike.
There are reports their drivers have been offered pay increases of 18 per cent – over a period of just under three years.
The outcome of the Luas dispute is expected to be watched closely by other sectors in the transport industry.
