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  • 1.
    Broman, Emanuel
    et al.
    VTI Swedish National Road and Transport Research Institute, Sweden; Linköping University, Sweden.
    Eliasson, Jonas
    Linköping University, Sweden.
    Aronsson, Martin
    RISE Research Institutes of Sweden, Digital Systems, Mobility and Systems.
    Efficient capacity allocation on deregulated railway markets2022In: Journal of Rail Transport Planning & Management, ISSN 2210-9706, E-ISSN 2210-9714, Vol. 21, article id 100294Article in journal (Refereed)
    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. © 2021

  • 2.
    Forsgren, Malin
    et al.
    RISE, Swedish ICT, SICS.
    Aronsson, Martin
    RISE, Swedish ICT, SICS.
    Gestrelius, Sara
    RISE, Swedish ICT, SICS.
    Maintaining tracks and traffic flow at the same time2013In: Journal of Rail Transport Planning & Management, ISSN 2210-9706, E-ISSN 2210-9714, Vol. 3, no 3, p. 111-123Article in journal (Refereed)
    Abstract [en]

    In an ideal world, all railway tracks would be available to trains at all times. In reality, track sections need to be closed every now and again for track maintenance and upgrades in order to ensure a satisfactory level of safety and comfort. In this paper, we present a MIP model that optimizes a production plan with regard to both trains and preventive maintenance. The planned maintenance activities may not be canceled, but may be moved in time within pre-defined time windows. Trains may be moved in time, redirected to other parts of the geography, or even canceled. The goal for the optimization is to find the best possible traffic flow given a fixed set of planned maintenance activities. In addition to presenting the model, we discuss the current maintenance planning process in Sweden, and exemplify the usefulness of our model in practice by applying it to two typical scenarios.

  • 3.
    Gestrelius, Sara
    et al.
    RISE - Research Institutes of Sweden (2017-2019), ICT, SICS.
    Aronsson, Martin
    RISE - Research Institutes of Sweden (2017-2019), ICT, SICS.
    Joborn, Martin
    RISE - Research Institutes of Sweden (2017-2019), ICT, SICS.
    Bohlin, Markus
    RISE - Research Institutes of Sweden (2017-2019), ICT, SICS.
    Towards a comprehensive model for track allocation and roll-time scheduling at marshalling yards2017In: Journal of Rail Transport Planning & Management, ISSN 2210-9706, E-ISSN 2210-9714, Vol. 7, no 3, p. 157-170Article in journal (Refereed)
    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.

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  • 4.
    Gestrelius, Sara
    et al.
    RISE Research Institutes of Sweden, Digital Systems, Mobility and Systems. Linköping University, Sweden.
    Peterson, Anders
    Linköping University, Sweden.
    Aronsson, Martin
    RISE Research Institutes of Sweden, Digital Systems, Mobility and Systems.
    Timetable quality from the perspective of a railway infrastructure manager in a deregulated market: An interview study with Swedish practitioners2020In: Journal of Rail Transport Planning & Management, ISSN 2210-9706, E-ISSN 2210-9714, Vol. 15, article id 100202Article in journal (Refereed)
    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.

  • 5.
    Joborn, Martin
    et al.
    RISE Research Institutes of Sweden, Digital Systems, Mobility and Systems. Linköping University, Sweden.
    Ranjbar, Zohreh
    RISE Research Institutes of Sweden, Digital Systems, Mobility and Systems.
    Understanding causes of unpunctual trains: Delay contribution and critical disturbances2022In: Journal of Rail Transport Planning & Management, ISSN 2210-9706, E-ISSN 2210-9714, Vol. 23, article id 100339Article in journal (Refereed)
    Abstract [en]

    In this paper we define new concepts and metrics for improved understanding of causes to unpunctual 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 unpunctuality 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 punctuality. The methods are useable in the continuous work to improve railway performance e.g., by prioritizing maintenance work that give best impact on punctuality. © 2022 The Authors

  • 6.
    Peterson, Anders
    et al.
    Linköping University, Sweden.
    Bohlin, Markus
    KTH Royal Institute of Technology, Sweden; Mälardalen University, Sweden.
    Joborn, Martin
    RISE Research Institutes of Sweden, Digital Systems, Mobility and Systems. Linköping University, Sweden.
    Guest editorial for the best papers of RailNorrköping 20192020In: Journal of Rail Transport Planning & Management, ISSN 2210-9706, E-ISSN 2210-9714, Vol. 15, article id 100204Article in journal (Other academic)
1 - 6 of 6
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