Canadian railways are exposed to various ground hazards because of the diverse geographic regions of the country. Keegan (2007) analysed these hazards and proposed hazard scenarios to evaluate the influence of these hazards on railway operations. Process modelling was used to develop the methodology for evaluating the hazards associated with a severe rainfall event. The methodology was applied by Shi (2006) to the Port Douglas case study. GIS technology was used to develop the methodology and facilitates the application of the methodology to any rainfall event.