Towards concurrent planning of railway maintenance and train services

Lidén, Tomas

doi:10.3384/lic.diva-128780

Cited by 7 publications

(9 citation statements)

References 57 publications

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“…In monetary volumes, the European countries have an average spending for maintenance and renewals of 70,000 EUR per km track and year (EIM-EFRTC-CER Working Group 2012). Statistically, the maintenance spendings are in the order of 40% of the gross value added for the railway sector in Europe, with similar figures found in Sweden (Lidén 2016).…”

Section: Introductionsupporting

confidence: 59%

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Coordinating maintenance windows and train traffic: a case study

Lidén

2020

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This paper concerns a case study for optimal planning and coordination of railway maintenance windows and train traffic. The purpose is to validate a previously presented optimization model on a demanding real-life problem instance and to obtain results that apply in similar planning situations. A mixed integer linear programming model is used for a 913 km long, single-track railway line through the northern part of Sweden, with traffic consisting of 82 trains per day, most of which are freight trains. Cyclic 1-day schedules are produced, which show that 2 h long maintenance windows can be scheduled with small adjustments of the train traffic. The sensitivity for cost changes is studied, which shows that the train costs must increase by more than 30% in order to change the structure of the window solutions. Resource efficient window schedules are obtained by assigning maintenance teams to all windows while respecting crew work and rest time restrictions. A comparison with manually constructed plans from the Swedish Transport Administration indicates that larger window volumes can be scheduled at a lower cost and with solution structures which are deemed reasonable and useful as guidance for constructing the real window patterns. Finally, we estimate that using an integrated planning approach (where maintenance and trains are jointly planned) instead of a sequential approach (where a train timetable has precedence over the maintenance windows), will give maintenance cost savings of 11-17%, without incurring any large cost increases for the train traffic. The paper also presents a method for achieving cyclic schedules without any period-deciding variables, and discusses the consequences of the aggregated capacity usage model that has been adopted.

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Section: Introductionsupporting

confidence: 59%

“…We use the same categorization as proposed in Lidén (2015Lidén ( , 2016, where three classes of tactical maintenance scheduling problems have been identified: (1) deterioration-based maintenance scheduling, (2) maintenance vehicle routing and team scheduling, and (3) possession scheduling.…”

Section: Maintenance Schedulingmentioning

confidence: 99%

Coordinating maintenance windows and train traffic: a case study

Lidén

2020

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“…Planning for maintenance can begin several years before it must be carried out. The Network Statement (JNB), published annually by Trafikverket, describes the conditions that exist for running traffic on the tracks during the coming train schedule and forms the basis for the continued planning of track work (Honauer and Ödeen 2017, Lidén 2016, SOU 2015. The JNB includes planned major rail works (PSB), which are activities that have a great impact on traffic and are announced 1.5 years before the timetable is valid.…”

Section: Planning Processmentioning

confidence: 99%

Lean Construction Principles and Railway Maintenance Planning

Ivina¹,

Olsson²

2020

Annual Conference of the International Group for Lean Construction

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Lean construction principles have been successfully adopted in a variety of industries to increase project management quality. This paper addresses maintenance planning in Sweden and analyses its effectiveness in the framework of lean construction principles. To investigate the status and improvement potential of maintenance contractors' performance, the study focuses on the detailed planning process, which is mainly the responsibility of contractors. A literature review, a data analysis and interviews were used to reveal the possible barriers to the adaptation of lean principles to the maintenance industry. The study presents a developed theoretical framework for the analysing maintenance processes in the perspective of lean construction principles. We found that the application of lean principles has the potential for improvements in the planning process, but there are some barriers to effective implementation, including a lack of knowledge about lean principles at contractors' sites.

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“…The literature overviews in Lidén (2015) and Lidén (2016) reveal an increase in research publications, particularly from year 2005 and onward. The tactical problem types have received most attention (more than half of the publications), and among these more than 1/3 address possession scheduling, which reflects the importance of this problem type.…”

Section: Research Contextmentioning

confidence: 99%

“…The different studies are shown in Figure 2.1, where the horizontal axis shows time order and the vertical axis roughly indicates the level of practical/theoretical content of the corresponding papers. The scope of the licentiate thesis (Lidén, 2016) and this thesis are shown with dotted and dashed boxes respectively.…”

Section: Research Design and Practical Notesmentioning

confidence: 99%

Concurrent planning of railway maintenance windows and train services

Lidén¹

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Efficiency in public and freight transportation systems is of great importance for a society. Railways can offer high capacity and relatively low environmental impact, but require that several technical systems are tuned and operate well. Specifically there is a tight interdependency between infrastructure and trains. The consequences are that all subsystems must be maintained and that the coordination of infrastructure activities and train operations is essential. Railway infrastructure maintenance and train services should ideally be planned together, but practice and research about railway scheduling has historically focused mainly on train operations and timetabling while maintenance planning has received less attention-and little research have considered the joint scheduling of both types of activities. Instead the traditional approach has been a sequential and iterative planning procedure, where train timetabling often has precedence over infrastructure maintenance. This thesis studies how maintenance windows, which are regular time windows reserved for maintenance work, can be dimensioned and jointly scheduled with train services in a balanced and efficient way for both maintenance contractors and train operators. Mathematical methods are used, with the aim of advancing the knowledge about quantitative methods for solving such coordination problems. The thesis contributes with new optimization models that jointly schedule maintenance windows and train services, investigates the solving efficiency of these models, and studies crucial extensions of the planning problem-primarily for the consideration of maintenance resources. Furthermore, the models are applied to, verified and validated on a demanding real-life problem instance. The main results are that integrated and optimal scheduling of maintenance windows and train services is viable for problems of practical size and importance, and that substantial maintenance cost savings can be achieved with such an integrated approach as compared to a traditional sequential planning process. The thesis consists of an introduction and overview of the research, followed by six papers which present: (1) A cost benefit model for assessment of competing capacity requests at a single location; (2) An optimization model for integrated scheduling of both maintenance windows and train services; (3) Mathematical reformulations that strengthen the optimization model; (4) Extensions for handling resource considerations and cyclic schedules; (5) A case study for a major single track line in Sweden; and (6) A mathematical study of length-restricted sequences under cyclic conditions. This work has been performed in the research project "Efficient planning of railway infrastructure maintenance", set up and conducted within the national research program "Capacity in the Railway Traffic System" (KAJT), and funded by Trafikverket with the grant TRV 2013/55886. To both KAJT and especially Trafikverket I want to express my sincere and deep gratitude for financing the work and providin...

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Towards concurrent planning of railway maintenance and train services

Cited by 7 publications

References 57 publications

Coordinating maintenance windows and train traffic: a case study

Coordinating maintenance windows and train traffic: a case study

Lean Construction Principles and Railway Maintenance Planning

Concurrent planning of railway maintenance windows and train services

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