Tuning Delay-propagation Models To Meet
Practical Planning Procedure Requirements
Author(s)
T. Büker
Abstract
Thanks to a direct operation on random variables and a suitable class of
cumulative distribution functions, the network-wide computation of delay
propagation in railway networks is enabled in short computation times. On this
basis, new work procedures to evaluate timetable robustness during the annual
capacity allocation phase, to assess the interactions between temporary speed
restrictions and to forecast the quality of operations have been established at
European infrastructure managers. In their practical application the need for
extensions appeared: Firstly, concepts of passenger services are often elaborated
in detail also for long-term purposes while, in contrast, knowledge on freight
services solely exists in numbers of trains per relation and time. Assuring
purposeful indicators demands a consideration of interaction with freight
services by linking the train-path representation of delay propagation with the
stream-based modelling of freight services. By applying methods of queuing
theory it proves possible to estimate the impact of \“unknown” train paths and to
incorporate the load-dependent spreading of knock-on delays to the passenger
service concept. Secondly, there is a need of fine-tuning the delay-propagation
model to consider the relationship between infrastructure utilisation and train
priorities. By manipulating the inequations underlying the stochastic operations,
a relationship of the dispatching regime to the server load is created, allowing a
closer fitting of simulation results to reality.
Keywords: timetabling, timetable robustness, delay propagation, queuing,
catalogue train paths.
Keywords
timetabling, timetable robustness, delay propagation, queuing,
catalogue train paths.
Related Book
Other papers in this volume
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