SAMFOST: a timetable-free way of analysing single-track railway lines
2007 (English)In: Proceedings of 2nd International Seminar on Railway Operations Modelling and Analysis / [ed] Hansen, I.A., Radtke, A., Pachl, J.P., Wendler E., 2007Conference paper (Refereed)
Operation of single-track railway lines is characterised by the stochastic crossing time. Important properties such as capacity, run times and overall punctuality are strongly dependent on the crossing time. In non-congested situations the crossing time can be modelled analytically. SAMFOST is a model that shows in a transparent way how the crossing time varies along a railway line. Including arrival delays, the mean crossing time (and standard deviation) can be calculated for different timetable crossing points. An important contribution is that the dependence between arrival delays and crossing time is shown explicitly.
SAMFOST has been successfully validated against the accepted simulation tool RailSys. The validation shows that SAMFOST has an acceptable accuracy as long as the crossing time depends only on the two crossing trains (non-congested situations).
Using SAMFOST, different types of measures to decrease the crossing time (and its variance) have been analysed. For example, a combined crossing and passenger stop gives a considerable decrease in the mean crossing time, but at the same time the variance increases. A combined crossing and passenger stop thus becomes more dependent on punctuality than a crossing at a station without passenger stop
Place, publisher, year, edition, pages
single-track, railway operation, delay
Research subject Järnvägsgruppen - Kapacitet
IdentifiersURN: urn:nbn:se:kth:diva-12720OAI: oai:DiVA.org:kth-12720DiVA: diva2:318276
2nd International Seminar on Railway Operations Modelling and Analysis
ProjectsFramtida infrastruktur och kvalitet i tågföring
QC 201006222010-05-072010-05-072012-02-28Bibliographically approved