Talks between Iarnród Éireann management and unions at the Workplace Relations Commission have been adjourned until Monday.
The talks are being held in an attempt to avert potential industrial action by train drivers in a dispute over mentoring of trainees and alleged breaches of procedures by management.
The National Bus and Rail Union and SIPTU are balloting for industrial action after management moved to implement a Labour Court recommendation without agreement after it was rejected by the drivers.
Under the recommendation drivers were to receive a pay increase of 1.15%, but mentoring of trainees, which had been voluntary, would be compulsory.
Iarnród Éireann says service expansion and career progression for more than 30 trainee drivers had been delayed for 21 months due to what it called "trade union non-cooperation", with pressure on driver resources now "intolerable".
On his way in to the talks earlier today, Dermot O'Leary of the NBRU said the company was accusing unions of something that they were not responsible for.
Mr O’Leary said there is an onus on the company, as well as drivers, to resolve the situation.
SIPTU’s Paul Cullen said his union has begun balloting members for all-out strike.