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Congested railways: influence of infrastructure and timetable properties on delay propagation
KTH, School of Architecture and the Built Environment (ABE), Transport and Economics (closed 20110301), Traffic and Logistics (closed 20110301). KTH, School of Engineering Sciences (SCI), Centres, The KTH Railway Group.ORCID iD: 0000-0002-5192-8074
2012 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

In this thesis the symptoms and underlying behaviour of congestion on railways are analysed and discussed. As well as in many other countries, Sweden faces increasing demand for transport. To meet this new demand, railways play an important role. Today, the capacity of the Swedish rail network is not upgraded at the speed necessary to keep up with the increase in traffic demand. The sensitivity of the railway system rises as the capacity utilisation increases. At some point the marginal gain of operating one extra train is lower than the costs in term of increased sensitivity to delay, i.e. maximum capacity has been reached.

Two methodologies are employed in this thesis to analyse capacity. The first uses real data from the Swedish rail network, train operation and delays to analyse how different factors influence available capacity and delay creation. Several useful key performance indicators are defined to describe capacity influencing properties of the infrastructure and the rail traffic. The rail network is divided into subsections for which the indicators have been estimated. This makes it possible to discern their different characteristics and identify potential weaknesses.

 The second approach employs the railway simulation tool RailSys in extensive simulation experiments. This methodology is used to analyse the characteristics of double track operation. Simulation of several hundred scenarios are conducted to analyse the influence of traffic density, timetable speed heterogeneity, primary delays and inter-station distance on secondary delays and used timetable allowance. The analysis gives an in-depth understanding of the mechanisms behind the performance of a double track.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2012. , x, 44 p.
Series
Trita-TSC-LIC, 12-005
National Category
Transport Systems and Logistics
Identifiers
URN: urn:nbn:se:kth:diva-97569ISBN: 978-91-85539-90-1 (print)OAI: oai:DiVA.org:kth-97569DiVA: diva2:533577
Presentation
2012-06-11, V2, KTH, Teknikringen 76, Stockholm, 14:15
Opponent
Supervisors
Note
QC 20120614Available from: 2012-06-14 Created: 2012-06-14 Last updated: 2012-06-14Bibliographically approved
List of papers
1. Kapacitetsanalys av järnvägsnätet i Sverige: Delrapport 2, Bearbetning av databas över infrastruktur, trafik, tidtabell och förseningar
Open this publication in new window or tab >>Kapacitetsanalys av järnvägsnätet i Sverige: Delrapport 2, Bearbetning av databas över infrastruktur, trafik, tidtabell och förseningar
2009 (Swedish)Report (Other academic)
Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2009. 73 p.
Series
TRITA-TEC-RR, ISSN 1653-4484 ; 10-003
National Category
Transport Systems and Logistics
Research subject
Järnvägsgruppen - Kapacitet
Identifiers
urn:nbn:se:kth:diva-76954 (URN)978-91-85539-57-4 (ISBN)
Note

TSC import 1155 2012-02-06. QC 20120417

Available from: 2012-02-06 Created: 2012-02-06 Last updated: 2015-07-16Bibliographically approved
2. A study of the performance and utilization of the Swedish railway network
Open this publication in new window or tab >>A study of the performance and utilization of the Swedish railway network
2010 (English)In: Road and Rail Infrastructure / [ed] Stjepan Lakušić, University of Zagreb , 2010Conference paper, Published paper (Refereed)
Abstract [en]

Many lines in the Swedish railway network are heavily utilized and the demand forfreight transport and passenger traffic is increasing. The Swedish National RailAdministration has been forced to declare some sections to be overloaded andwith the up-coming deregulation of railway traffic, the load is going to increaseeven more.This paper describes how the performance of the entire Swedish railway networkhas been investigated and the results. Data from several different databases(supplied by the Swedish Railway Administration) has been processed. The dataconsists of the scheduled timetable, data about the design of the infrastructureand operational data such as recorded delays, train weights and train lengths.To perform the calculations, the railway network has been divided into 123sections. The division has been made according to traffic patterns and type ofinfrastructure (single-track, double-track). For each line, the data has been usedto calculate several descriptive parameters, e.g. delay development, number oftrains/h during different parts of the day, time for the peak hour, inter-stationdistance, track length, train length, train weight, total mass/day (freight trains),train average speed and the heterogeneity of the train speeds.Together, all of the parameters form a picture of the traffic flows in the Swedishrailway grid and identifies the characteristics of the different lines such as: load,traffic mix, delay situation and infrastructure performance. The information can beused to detect deficiencies and propose possible solutions.Finally, the correlation between the calculated parameters and the delay situationhas been investigated.

Place, publisher, year, edition, pages
University of Zagreb, 2010
Keyword
performance, capacity, load, traffic mix, delay
National Category
Transport Systems and Logistics
Research subject
Järnvägsgruppen - Kapacitet
Identifiers
urn:nbn:se:kth:diva-76815 (URN)978-953-6272-38-9 (ISBN)
Conference
CETRA 2010. Opatija, Croatia. 17-18 May 2010
Note

QC 20120418

Available from: 2012-02-06 Created: 2012-02-06 Last updated: 2015-09-02Bibliographically approved
3. Investigating The Impact Of Timetable Properties On Delay Propagation On A Double-Track Line Using Extensive Simulation
Open this publication in new window or tab >>Investigating The Impact Of Timetable Properties On Delay Propagation On A Double-Track Line Using Extensive Simulation
2011 (English)Conference paper, Published paper (Refereed)
Abstract [en]

Today many railway lines are operated close to maximum capacity. A common question asked is: “How is the quality of operation affected if one additional train/h is scheduled?” With the upcoming deregulation of operation, the necessity to be able to answer this question accurately increases when service operators that are denied train slots due to congestion demand a motivation.

The objective of this paper is to investigate how secondary delays on a congested double-track line depend on several parameters such as:

  • Number of trains/h.

  • Timetable heterogeneity (speed difference).

  • Primary delay levels.

  • Inter-station distance.

Each combination of settings of the parameters is investigated to capture possible interaction effects.

The infrastructure model consists of a fictitious double-track line with overtaking stations at regular intervals. A program that generates timetables and perturbation data according to specified input settings is developed. The output of the program is data files that can be read directly by the well-known simulation tool RailSys. This process makes it possible to simulate the hundreds of different timetables that are the result when the parameters investigated are varied. The outcome of the simulations is analysed to find the influence of the investigated parameters on the secondary delays.

Keyword
Train delay, railway operation, double-track, simulation, heterogeneity
National Category
Transport Systems and Logistics
Research subject
Järnvägsgruppen - Kapacitet
Identifiers
urn:nbn:se:kth:diva-76752 (URN)
Conference
Railway Engineering. London, UK. 29th June 2011 - 30th June 2011
Note

QC 20120330

Available from: 2012-02-06 Created: 2012-02-06 Last updated: 2015-09-02Bibliographically approved

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