ASSESSING THE EFFECTS OF RAILWAY INFRASTRUCTURE FAILURE

Although network modelling techniques have been available for a number of years now, in the transport sector they have largely been confined to the planning function, and the analysis of schemes with long lead- times. However, recent analysis by London Underground Ltd has used a N etwork Model to estimate changes in revenue and passenger time resulti ng from the possible failure of key parts of their infrastructure. Fut ure engineering strategy will attempt to repair first those sites wher e the disbenefits of failure are greatest. This paper also introduces a number of algorithmic developments (in terms of a group of choice mo dels) which have underpinned this analysis and have significantly impr oved the accuracy of the modelling tools available.