Passengers on the Dublin to Westport train yesterday evening were stuck onboard for two hours when it broke down near Castlebar.
The train had left Dublin at 20 to to 2 on Sunday afternoon and broke down at ten to five.
Service resumed shortly before 7pm.
Irish Rail spokesperson Jane Cregan told Midwest News this morning that the cause of the delay was a mechanical fault with the train.
She admitted that communication to passengers on the cause of the delay yesterday evening may have been minimal. Outlining that while some announcements were made, the driver was outside of the cab attempting to rectify the problem for most of the time the train was stopped and this may have contributed to the small number of announcements made.
The driver and maintenance staff did manage to get the train going and brought passengers to their destination.
The 3.40pm train from Heuston to Westport yesterday terminated at Claremorris station and a bus to Westport was provided.
Bus transfers also brought passengers who had intended on taking the 5.45pm train from Westport to Dublin to Claremorris station.
Ms Cregan apologised on behalf of Irish Rail to all passengers caught up in the delay.