The stationmaster on the day of the tragedy John Foster facilitated the oversell of tickets for the excursion. 

Whether through a lack of backbone in not managing the number of passangers ,or a misplaced loyalty to make more money for the GNR (or himself)

his remiss in not informing Dundalk depot of the increase in numbers was a major element in the terrible loss of life.

David O'Toole has recognised these possible failures in  Foster's character and plays them with conviction.