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  • 1.
    Ait Ali, Abderrahman
    et al.
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Kommunikations- och transportsystem. Linköpings universitet, Tekniska fakulteten. Swedish National Road and Transport Research Institute (VTI), Sweden.
    Lindberg, Per Olov
    Swedish National Road and Transport Research Institute (VTI), Sweden.
    Eliasson, Jonas
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Kommunikations- och transportsystem. Linköpings universitet, Tekniska fakulteten.
    Nilsson, Jan-Eric
    Swedish National Road and Transport Research Institute (VTI), Sweden.
    Peterson, Anders
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Kommunikations- och transportsystem. Linköpings universitet, Tekniska fakulteten.
    A disaggregate bundle method for train timetabling problems2020Inngår i: Journal of Rail Transport Planning & Management, ISSN 2210-9706, E-ISSN 2210-9714, Vol. 16, artikkel-id 100200Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The train timetabling problem (TTP) consists of finding a feasible timetable for a number of trains which minimises some objective function, e.g., sum of running times or deviations from ideal departure times. One solution approach is to solve the dual problem of the TTP using so-called bundle methods. This paper presents a new bundle method that uses disaggregate data, as opposed to the standard bundle method which in a certain sense relies on aggregate data. We compare the disaggregate and aggregate methods on realistic train timetabling scenarios from the Iron Ore line in Northern Sweden. Numerical results indicate that the proposed disaggregate method reaches better solutions faster than the standard aggregate approach.

    Fulltekst (pdf)
    fulltext
  • 2.
    Andersson, Emma V.
    et al.
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Kommunikations- och transportsystem. Linköpings universitet, Tekniska högskolan.
    Peterson, Anders
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Kommunikations- och transportsystem. Linköpings universitet, Tekniska högskolan.
    Törnquist Krasemann, Johanna
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Kommunikations- och transportsystem. Linköpings universitet, Tekniska högskolan. Blekinge Institute of Technology, Department of Computer Science and Engineering, Karlskrona, Sweden .
    Quantifying railway timetable robustness in critical points2013Inngår i: Journal of Rail Transport Planning & Management, ISSN 2210-9706, E-ISSN 2210-9714, Vol. 3, nr 3, s. 95-110Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Several European railway traffic networks experience high capacity consumption during large parts of the day resulting in delay-sensitive traffic system with insufficient robustness. One fundamental challenge is therefore to assess the robustness and find strategies to decrease the sensitivity to disruptions. Accurate robustness measures are needed to determine if a timetable is sufficiently robust and suggest where improvements should be made.

    Existing robustness measures are useful when comparing different timetables with respect to robustness. They are, however, not as useful for suggesting precisely where and how robustness should be increased. In this paper, we propose a new robustness measure that incorporates the concept of critical points. This concept can be used in the practical timetabling process to find weaknesses in a timetable and to provide suggestions for improvements. In order to quantitatively assess how crucial a critical point may be, we have defined the measure Robustness in Critical Points (RCP). In this paper, we present results from an experimental study where a benchmark of several measures as well as RCP has been done. The results demonstrate the relevance of the concept of critical points and RCP, and how it contributes to the set of already defined robustness measures.

    Fulltekst (pdf)
    fulltext
  • 3.
    Broman, Emanuel
    et al.
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Kommunikations- och transportsystem. Linköpings universitet, Tekniska fakulteten. Swedish Natl Rd & Transport Res Inst VTI, Sweden.
    Eliasson, Jonas
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Kommunikations- och transportsystem. Linköpings universitet, Tekniska fakulteten.
    Aronsson, Martin
    RISE, Kista, Sweden.
    Efficient capacity allocation on deregulated railway markets2022Inngår i: Journal of Rail Transport Planning & Management, ISSN 2210-9706, E-ISSN 2210-9714, Vol. 21, artikkel-id 100294Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    As railway markets are increasingly deregulated, coordinating and prioritising between capacity requests becomes more complex and more important. This paper describes the advantages and challenges of different allocation methods in vertically separated open-access railway markets, with several railway operators and heterogeneous traffic, and where a public infrastructure manager must resolve operators conflicting path requests. Three broad groups of allocation methods are described: administrative methods, allocation by social cost-benefit analysis and willingness-to-pay based allocation. We describe pros and cons of these allocation principles for three different market segments: commercial traffic with long planning horizons, (subsidized) traffic controlled by public transport agencies, and traffic with short planning horizons. We then outline an allocation process that meets the requirements of a deregulated market better than conventional methods. It is a mixed method, which uses an auction-like mechanism to allocate pre-defined paths to commercial operators on specified, capacity-constrained lines. The net social benefits of capacity reserved for traffic controlled by public transport agencies is assessed through social cost-benefit analysis of timetables. The benefits decrease when timetables are adjusted to make room for additional commercial train paths; the size of this loss determines the reservation price of the auction-like mechanism. Dynamic pricing is used for short-term allocation on congested line segments.

  • 4.
    Gestrelius, Sara
    et al.
    RISE SICS AB, Kista, Sweden.
    Aronsson, Martin
    RISE SICS AB, Kista, Sweden.
    Joborn, Martin
    RISE SICS AB, Kista, Sweden.
    Bohlin, Markus
    RISE SICS AB, Kista, Sweden.
    Towards a comprehensive model for track allocation and roll-time scheduling at marshalling yards2017Inngår i: Journal of Rail Transport Planning & Management, ISSN 2210-9706, E-ISSN 2210-9714, Vol. 7, nr 3, s. 157-170Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This paper considers multi-stage train formation with mixed usage tracks at a marshalling yard without departure yard. A novel integer programming model for scheduling shunting tasks as well as allocating arrival yard tracks and classification bowl tracks is presented. By taking a comprehensive view of the marshalling yard operations, more effective schedules can be found, and a variety of characteristics can be optimised, including shunting work effort, number or cost of tracks, and shunting task start times. Two different objective functions are evaluated: minimising work effort in terms of wagon pull-backs and minimising track costs. A procedure for finding a hot-start solution with few wagon pull-backs is also presented. The proposed model is tested on real data from Sävenäs marshalling yard in Sweden. The results show that the method is able to return an optimal schedule for a planning period of 4 days if the hot-start solution is optimal or the remaining problem is tractable for the heuristics in CPLEX.

  • 5.
    Gestrelius, Sara
    et al.
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Kommunikations- och transportsystem. Linköpings universitet, Tekniska fakulteten. RISE Res Inst Sweden, Sweden.
    Peterson, Anders
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Kommunikations- och transportsystem. Linköpings universitet, Tekniska fakulteten.
    Aronsson, Martin
    RISE Res Inst Sweden, Sweden.
    Timetable quality from the perspective of a railway infrastructure manager in a deregulated market: An interview study with Swedish practitioners2020Inngår i: Journal of Rail Transport Planning & Management, ISSN 2210-9706, E-ISSN 2210-9714, Vol. 15, artikkel-id 100202Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Railway capacity allocation in a deregulated market requires planners to solve a mathematically complex optimization problem while simultaneously arbitrating the wants and needs of different stakeholders. This paper analyses timetable quality from the perspective of timetable planners working for the Swedish infrastructure manager Trafikverket. Seven quality aspects are discussed: feasibility, disturbance resistance, competition management, capacity safeguarding, application fulfilment, attractiveness and compatibility with surrounding planning areas. Each aspect is introduced, including references to legal documents, development projects, and research literature. Further, an interview study with eight practitioners gives insight into the current state of practice in Sweden. The practitioners consider feasibility to be both most important and easiest to handle. Capacity safeguarding is considered least important, despite its prevalence in legal documents and envisioned process developments, and is also considered hardest to handle. In general, formal rules and guidelines seem important for emphasising the importance of a quality aspect in the planning process. To better support the planners in their arbitrating role, timetable planning tools based on mathematical optimization models could be implemented. For example, support tools could be used to analyse different solutions, and could unburden the planner from working with feasibility aspects by providing automatic conflict identification and resolution.

  • 6.
    Joborn, Martin
    et al.
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Kommunikations- och transportsystem. Linköpings universitet, Tekniska fakulteten. RISE Res Inst Sweden, Sweden.
    Ranjbar, Zohreh
    RISE Res Inst Sweden, Sweden.
    Understanding causes of unpunctual trains: Delay contribution and critical disturbances2022Inngår i: Journal of Rail Transport Planning & Management, ISSN 2210-9706, E-ISSN 2210-9714, Vol. 23, artikkel-id 100339Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this paper we define new concepts and metrics for improved understanding of causes to un-punctual trains. The metrics are denoted delay contribution and critical disturbance. Delay contribution can be interpreted as how much a specific disturbance contributes to the delay of a train and the critical disturbances can be interpreted as the disturbances that made the train become unpunctual. The metrics are applied in a test case with trains in southern Sweden. The results show that the metrics can provide a complementary view regarding causes to unpunctu-ality compared to standard methods and are able to pinpoint disturbances that made trains become unpunctual and separate them from disturbances that have less impact on the punctu-ality. The methods are useable in the continuous work to improve railway performance e.g., by prioritizing maintenance work that give best impact on punctuality.

    Fulltekst (pdf)
    fulltext
  • 7.
    Lidén, Tomas
    et al.
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Kommunikations- och transportsystem. Linköpings universitet, Tekniska fakulteten.
    Joborn, Martin
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Kommunikations- och transportsystem. Linköpings universitet, Tekniska fakulteten.
    Dimensioning windows for railway infrastructure maintenance: Cost efficiency versus traffic impact2016Inngår i: Journal of Rail Transport Planning & Management, ISSN 2210-9706, E-ISSN 2210-9714, Vol. 6, nr 1, s. 32-47Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The Swedish Transport Administration is introducing a new regime, called maintenance windows, for allocating train free slots reserved for maintenance tasks on the railway infrastructure. In this paper, a model for the assessment and the dimensioning of such maintenance windows is presented, which considers marginal effects on both the maintenance cost and the expected train traffic demand. The aim is to establish quantitative measures that can be used for comparing conflicting capacity requests from infrastructure maintenance and traffic operations on railway networks. The model is demonstrated in a cost benefit analysis for a real life case study on the Swedish Northern Main Line.

    Fulltekst (pdf)
    fulltext
  • 8.
    Lidén, Tomas
    et al.
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Kommunikations- och transportsystem. Linköpings universitet, Tekniska fakulteten.
    Kalinowski, Thomas
    University of Newcastle, School of Mathematical & Physical Sciences, Callaghan, NSW 2308, Newcastle, Australia; University of New England, School of Science and Technology, Armidale, NSW 2350, Australia.
    Waterer, Hamish
    University of Newcastle, School of Mathematical & Physical Sciences, Callaghan, NSW 2308, Newcastle, Australia.
    Resource considerations for integrated planning of railway traffic and maintenance windows2018Inngår i: Journal of Rail Transport Planning & Management, ISSN 2210-9706, E-ISSN 2210-9714, Vol. 8, nr 1, s. 1-15Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Abstract This paper addresses the coordination of railway network maintenance and train traffic. The work extends a previously developed optimization model by considering maintenance resource constraints for crew availability and work time regulations. The aim is to find a long term tactical plan that minimizes the total cost of maintenance and train operations, where train services and train free windows are scheduled such that maintenance can be carried out by a pool of crew resources, which are divided into bases and have limitations on maximum working hours per day and minimum rest time between these working days. A mixed integer linear programming model along with computational experiments are presented which show that these resource considerations can be correctly handled with a moderate increase in model size and solution time.

    Fulltekst (pdf)
    fulltext
  • 9.
    Peterson, Anders
    et al.
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Kommunikations- och transportsystem. Linköpings universitet, Tekniska fakulteten.
    Bohlin, Markus
    KTH Royal Inst Technol, Sweden; Malardalen Univ, Sweden.
    Joborn, Martin
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Kommunikations- och transportsystem. Linköpings universitet, Tekniska fakulteten. RISE Res Inst Sweden, Sweden.
    Guest editorial for the best papers of RailNorrkoping 20192020Inngår i: Journal of Rail Transport Planning & Management, ISSN 2210-9706, E-ISSN 2210-9714, Vol. 15, artikkel-id 100204Artikkel i tidsskrift (Annet vitenskapelig)
    Abstract [en]

    n/a

  • 10.
    Rosberg, Tomas
    et al.
    Swedish Rd & Transport Res Inst, VTI, Linkoping, Sweden.
    Cavalcanti, Thiago
    Swedish Rd & Transport Res Inst, VTI, Linkoping, Sweden.
    Thorslund, Birgitta
    Swedish Rd & Transport Res Inst, VTI, Linkoping, Sweden.
    Prytz, Erik
    Linköpings universitet, Institutionen för datavetenskap, Interaktiva och kognitiva system. Linköpings universitet, Filosofiska fakulteten.
    Moertl, Peter
    Virtual Vehicle Res GmbH, Austria.
    Driveability analysis of the european rail transport management system (ERTMS): A systematic literature review2021Inngår i: Journal of Rail Transport Planning & Management, ISSN 2210-9706, E-ISSN 2210-9714, Vol. 18, artikkel-id 100240Artikkel, forskningsoversikt (Fagfellevurdert)
    Abstract [en]

    Train drivers in Sweden had the opportunity to test the new European Rail Transport Management System (ERTMS) during the early implementation of this signaling system in 2011 and 2012. Unfortunately, they have reported many implementation problems. These ERTMS lines have been evaluated as more challenging to drive compared to the previous signaling system. A systematic literature review was conducted to understand what network planning designers typically focus on when analyzing railway driveability and how driveability can be assessed. In the overall picture the impact on driveability originates from both technological, organizational, and train driver aspects. One technological issue found during the investigation is related to the speed profile design. Frequent speed changes were identified as the primary source of negative experiences during driveability evaluations, especially on retrofitted lines. Results also indicate the need for a methodology that includes the driver earlier in the network planning test process, to avoid the costly and time-consuming analysis done after project implementation. The results highlight the importance of the speed profile design to provide good driveability. Cognitive Task Analysis, simulations, and statistical calculations to predict driver and train performance were identified as applicable methods to involve train drivers earlier in the driveability analysis process.

    Fulltekst (pdf)
    fulltext
  • 11.
    Rosberg, Tomas
    et al.
    VTI, Olaus Magnus Vag 35, S-58195 Linkoping, Sweden.
    Thorslund, Birgitta
    Linköpings universitet, Institutionen för datavetenskap, Människocentrerade system. Linköpings universitet, Filosofiska fakulteten.
    Impact on driver behavior from ERTMS speed-filtering2023Inngår i: Journal of Rail Transport Planning & Management, ISSN 2210-9706, E-ISSN 2210-9714, Vol. 26, artikkel-id 100386Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In the signal planning process, the ERTMS speed profiles based on track nature needs to be complemented with additional constraints. The base profile resolving the allowed track speed, often includes several speed changes which can be difficult for the train driver to follow. One approach to deal with this problem is to filter the base profile, reducing the number of changes and giving the driver more time for attention.This paper presents the effects of a speed profile filtering principle, based on possible time usage during a speed increase, on train energy consumption, train driver braking behavior, running time, and driver workload. In an Electrical Multiple Unit train driver simulator, 40 drivers tested three different speed profiles of a 19 km railway line. It can be concluded that differences in running time are small, that these small time-gains implies a high energy con-sumption cost, and that drivers tend to drive close to the indication braking curve in the beginning of the braking phase. Further, the drivers rated the driver task workload low for all filter conditions. Accordingly, a certain filter level is required to get capacity and energy effects.

    Fulltekst (pdf)
    fulltext
  • 12.
    Solinen, Emma
    et al.
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Kommunikations- och transportsystem. Linköpings universitet, Tekniska fakulteten. Trafikverket, Sundbyberg, Sweden.
    Nicholson, Gemma
    Birmingham Centre for Railway Research and Education, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK.
    Peterson, Anders
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Kommunikations- och transportsystem. Linköpings universitet, Tekniska fakulteten.
    A microscopic evaluation of railway timetable robustness and critical points2017Inngår i: Journal of Rail Transport Planning & Management, ISSN 2210-9706, E-ISSN 2210-9714, Vol. 7, nr 4, s. 207-223Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    One method to increase the quality of railway traffic flow is to construct a more robust timetable in which trains are able both to recover from delays and the delays are prevented from propagating. Previous research results show that the indicator Robustness in Critical Points (RCP) can be used to increase timetable robustness. In this paper we present the use of a method for RCP optimization: how it can be assessed ex-post via microscopic simulation. From the evaluation we learn more about how increased RCP values influence a timetable's performance. The aim is to understand more about RCP increase at a localised level within a timetable in terms of effects to the pairs of trains that are part of the indicator. We present a case study where an initial timetable and a timetable with increased RCP values are evaluated. The ex-post evaluation includes the quantification of measures concerning train-borne delay and robustness of operations, as well as measures capturing the subsequent quality of service experienced by passengers to assess the broader effects of improved robustness. The result shows that it is necessary to use several key performance indicators (KPIs) to evaluate the effects of an RCP increase. The robustness increases at a localised level, but the results also indicate that there is a need to analyse the relationship between ex-post measures and RCP further, to improve the method used to increase RCP and thus its overall effect on timetable robustness.

  • 13.
    Törnquist Krasemann, Johanna
    et al.
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Kommunikations- och transportsystem. Linköpings universitet, Tekniska högskolan.
    Backåker, Lars
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Kommunikations- och transportsystem. Linköpings universitet, Tekniska högskolan.
    Trip Plan Generation using Optimization: A Benchmark of Freight Routing and Scheduling Policies within the Carload Service Segment2012Inngår i: Journal of Rail Transport Planning & Management, ISSN 2210-9706, E-ISSN 2210-9714, Vol. 2, nr 1-2, s. 1-13Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The rail freight carload service segment enables the distribution of freight volumes down to the unit of single rail cars, and stand as an important alternative to road transportation. However, this service segment is often associated with significant uncertainties and variations in daily freight volumes. Such uncertainties are challenging to manage since operating plans generally are established long in advance of operations. Flexibility can instead be found in the way trip plans are generated. Previous research has shown that a commonly used trip plan generation policy does not exploit the available flexibility to the full extent. In this paper, we therefore suggest an optimization-based freight routing and scheduling (OFRS) policy to address the rail freight trip plan generation problem. This OFRS-policy generates trip plans for rail cars while still restricted by the customer commitments. The policy involves a MIP formulation with a continuous time representation and is solved by commercial software. We apply the OFRS-policy on a case built on real data provided by the Swedish rail freight operator, Green Cargo, and assess the performance of the policy comparing the current industry practice. The results show that by using the OFRS policy, we can achieve a reduction in the total transportation times, number of shunting activities and potentially also a reduction in the service frequency given the considered transport demand.

    Fulltekst (pdf)
    Backåker_TörnquistKrasemann_2012
1 - 13 of 13
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