80% of DART services have been running despite unofficial strike action by 21 drivers.
The company said it does not anticipate any disruption to services tomorrow.
Meanwhile, the National Bus and Rail Workers' Union has strongly denied claims that the unofficial action was due to an inter-union row between SIPTU and the NBRU.
NBRU General Secretary Liam Tobin said the row was about changes to rosters which were introduced without consultation as promised by the company.
Talks aimed at resolving the dispute are scheduled for Thursday.
The unofficial action by 21 DART drivers led to the cancellation of six train services in the capital earlier today.
Both NBRU and SIPTU members were among those on strike.
