Impacts of infrastructure, timetable and perturbations in operation of double-track railway lines with mixed traffic
2010 (English)In: 12th World Conference on Transportation Research 2010, 2010Conference paper (Refereed)
Delays play a central role in railway operation. They are of great importance both for customers and operators. They are direct measures of quality and reliability and hereby also an important factor for the competitiveness of the entire railway. Indirectly, the delays also affect quantitative factors such as capacity, i.e. the number of trains that can be (practically) operated. For these reasons, analysis of delays and delay propagation is an essential part of railway operations research.
The up-coming deregulation of railway traffic means that completely mixed traffic can be foreseen on the Swedish railway network. This article shows how the delays on a double-track railway line, operated with mixed traffic, are affected by infrastructure, timetable and primary delays. Experimental design, simulation and response surface metamodelling are applied in a multi-factor simulation experiment with nine factors.
The combination of simulation and experimental design makes it possible to draw general conclusions from a limited number of simulated variants and this type of multi-factor analysis is essential to an understanding of the railway as an operational system. The derived metamodels may also be used in different types of planning processes.
The metamodels show that speed and frequency factors have a great impact on delays. Freight train speed and the frequency of service of high-speed trains in particular turned out to be important. Perturbation factors, i.e. entry delays, were found to affect the delays less. Neither does the distance between adjacent overtaking stations in itself affect the delays. However, the inter-station distance still affects delays through interactions with other factors.
Place, publisher, year, edition, pages
Double-track, timetable, railway operation, railway capacity, experimental design, simulation, delays, reliability
Research subject Järnvägsgruppen - Kapacitet
IdentifiersURN: urn:nbn:se:kth:diva-12725OAI: oai:DiVA.org:kth-12725DiVA: diva2:318286
12th World Conference on Transportation Research, Lisbon, Portugal
ProjectsFramtida infrastruktur och kvalitet i tågföring