Drivers on Dublin's DART rail network were on wildcat strike yesterday over the imposition of new rosters.
Claims were made that the action was due to an inter-union row between SIPTU and the NBRU. However the National Bus and Rail Workers' Union has strongly denied this.
NBRU General Secretary Liam Tobin said the row was about changes to rosters which were introduced without consultation as promised by the company.
Six train services were cancelled during the day in the action which include both NBRU and SIPTU members.