Strike action at Brinks Allied is set to go ahead on Thursday after talks at the Labour Relations Commission broke up this evening without resolution.
A Labour Court hearing has been scheduled for tomorrow afternoon leaving less than 48 hours before pickets are placed outside the security firm's depot in Dublin.
After the LRC hearing today, SIPTU branch secretary Mr Kevin McMahon said he looked forward to the "Labour Court impartially investigating the issues and making a recommendation that can resolve the dispute, leading to a full resumption of work and restoration of ATM services".
The dispute centres on the introduction of new cash delivery vans and operating procedures that workers claim would leave them more vulnerable to attack during armed robberies.
Workers say management introduced the new measures without a health and safety review and contrary to agreed consultation procedures at the company.
The two-week dispute has disrupted cash deliveries to ATMs on the east coast as the company has responsibility for refilling about 240 machines, mainly in Dublin and the north-east.
The machines are being serviced by supervisors but in the event of a full out strike the staff have warned that they will not pass a picket.
Last week, the security van staff voted in favour of strike action by 60 votes to nine.
The National Implementation Body has intervened in the dispute, and the two sides have twice been to the LRC. However despite 11 hours of talks at the LRC on Friday, they failed to reach an agreement.
Affected customers meanwhile have been advised to use telephone and Internet banking, and to use Laser cards to get cashback.