After 16 days of intensive negotiations at the Workplace Relations Commission, talks have broken down without agreement.
The unions have now referred a number of issues to the Labour Court and the company have agreed to attend.
The Bus Éireann strike has entered its 19th day.
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Among the cuts proposed by the company is the closure of the Clonmel depot and the axing of the Clonmel – Dublin Expressway service.
Unions say any proposed deal has to ensure that these measures also apply to management.