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Title Railway capacity studies between Jerez and Cádiz, in Spain
Author Bustinduy, Marcial
Supervisor Landex, Alex (Traffic Modelling Group, Center for Traffic and Transport, Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark)
Kaas, Anders H. (Traffic Modelling Group, Center for Traffic and Transport, Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark)
Nielsen, Otto Anker (Traffic Modelling Group, Center for Traffic and Transport, Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark)
Institution Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark
Thesis level Master's thesis
Year 2004
Abstract The Msc Thesis develops a rail capacity assessment applied to the line between Jerez and Cádiz, at the extension of Madrid-Sevilla rail line. Computer software has shown to be a very effective tool for assessing this kind of studies since they can simulate the complex situations: Rail traffic takes place when infrastructure, rolling stock and operational tools interact, so a detailed analysis about their conditions is carried out by means of computer tools. The three traffic components are introduced in RailSys, a conflict free simulation is run and random delays are finally simulated to analyze their propagation in every case through statistical evaluations. The different cases have been analyzed according to this proceeding in order to analyze their feasibility and capacity. A description of the area under consideration (characterized by a spread distribution of the population among five main centres) and its traffic situation are analyzed along the first chapters in order to realize the main problems which should be relieved. The European bet on Railways through a new concept, a broad high speed rail network, also carries weight on the necessary changes to carry out. Thus, different researches and statistics have been quoted in order to describe the framework where the upgrading project is developed, since the rail framework plays an important role. In a few words, the purpose is achieving a great increase in rail participation at the mobility in the area. Thus, it is necessary to increase the number of trains, achieving a frequency of 20 or 10 minutes for commuter trains during the peak time (depending on the section of the line). Other aims are to reduce journey times and to get stations closer to the new urban areas. Once the outline of a future rail service along the Bay of Cádiz has been described, the project analyzes the chances to face the aim under the present rail scenario. Different theoretical explanations about rail capacity on single track lines are developed along this study to get a better knowledge of the problem; the key in those lines is the management of crossings at stations to avoid deadlocks, since trains in both directions have to share the same track. The analyses of the single track line show a great number of problems which lead the author to the conclusion of its being saturated, so the single track line does not seem to be able to host the new conditions in spite of any possible minor renewal. The Ministry of Public Works had already realized that situation, and it is developing a project to build a double track line along the whole section, together with a new rolling stock, which can face up the future scenario. Nevertheless, the ministerial project for building a double track is at its early steps nowadays: some sections have already been passed, but other data are too uncertain yet. The author assumes some of the ministerial choices and adapts others in order to develop an analysis about the feasibility of the ministerial project to face up the future rail traffic (in basis on the scenario in 2007). The report draws a realistic timetable to fit rail traffic to the pursued objectives. The projected line provides enough capacity to achieve the objectives thanks to the advantages of double track lines, so the model is noticeably better than the single track line. Nevertheless, the mix of services at very different speeds and the geographical and environmental aspects constrain its capacity and cause a fair traffic forecast if we take into account that we deal with a new line. Double track lines have a much greater capacity than single track ones, but rail traffic run in a very different way. Theoretical explanations about the influence of headways on rail capacity and different tools to increase capacity are developed in order to get a better knowledge of the future rail traffic and about some weak points to work on. As a capacity assessment, four alternatives to operate traffic along the line have been proposed according to different dispatching tools. The Msc Thesis judges these alternatives by the assistance of RailSys and concludes the advantages that a two-way track running offers to rail traffic under the conditions of the project when it is scheduled in a right way. Nevertheless, a wrong two-way running may damage the results. Anyway, the choice of a better alternative is subject to the criterion of anybody: for example, a regular timetable or fastest speeds are different preferences, as traffic load is inversely connected to the punctuality. In addition to this, the building of a new station is also tested to check whether it contributes to reduce delays or it does not. The results are slightly better, but the idea is rejected because of the investment costs. Thus, a critique of the future traffic conditions and the bottlenecks of the rail line are extracted so that they can be taken into consideration. The different chapters let us to conclude the importance of every detail to improve rail capacity, and the ministerial project looks to have leaved aside important elements which would contribute to make the most of the investment.
Pages 273
Admin Creation date: 2006-06-22    Update date: 2007-02-24    Source: dtu    ID: 182584    Original MXD