A woman gave birth to a baby girl on board a train travelling from Tullamore to Dublin on Tuesday evening.
Off-duty doctor Alan Devine from Donegal, an Irish Nurse and American Nurse, came to the woman's aid after she went into labour on the 15.05 service.
The train was understood to be packed with passengers who were travelling to the Backstreet Boys concert.
The train stopped at Kildare Station at around 5pm and emergency services were notified.
A part of the carriage was sectioned off to ensure privacy for the woman and she gave birth in the area in between carriages.
Glass doors were also locked and covered by Irish Rail staff .
The train remained at Kildare Station for 80 minutes and ambulance crew then took the newborn and her mum to hospital.
Mother and baby are said to be doing well.