Sökning: "railway tracks"

Visar resultat 1 - 5 av 46 avhandlingar innehållade orden railway tracks.

  1. 1. Railway operation analysis : Evaluation of quality, infrastructure and timetable on single and double-track lines with analytical models and simulation

    Författare :Olov Lindfeldt; Bo-Lennart Nelldal; Lars-Göran Mattsson; Ingo Hansen; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Railway operation; Railway capacity; Single-track; Double-track; Partial double-track; Inter-station distance; Delay; Delay propagation; Crossing; Overtaking; Timetable flexibility; Simulation; Experimental design; Civil engineering and architecture; Samhällsbyggnadsteknik och arkitektur;

    Sammanfattning : This thesis shows the advantages of simple models for analysis of railway operation. It presents two tools for infrastructure and timetable planning. It shows how the infrastructure can be analysed through fictive line designs, how the timetable can be treated as a variable and how delays can be used as performance measures. LÄS MER

  3. 2. Quality on single-track railway lines with passenger traffic : Anlytical model for evaluation of crossing stations and partial double-tracks

    Författare :Olov Lindfeldt; Bo-Lennart Nelldal; Lars-Göran Mattsson; Nils Olsson; KTH; []
    Nyckelord :Railway operation; Railway capacity; single-track; crossing station; partial double-track; TECHNOLOGY; TEKNIKVETENSKAP;

    Sammanfattning : Railway transportation is showing a substantial increase. Investments in new infrastructure, new fast and comfortable vehicles, and high frequency of service are important factors behind the increase.Infrastructure configuration and timetable construction play important roles in the competitiveness of railway transportation. LÄS MER

  4. 3. Leveraging Data-Driven and Alignment Techniques for Optimal Railway Track Maintenance Scheduling

    Författare :Mahdi Khosravi; Alireza Ahmadi; Uday Kumar; Iman Soleimanmeigouni; Anders Ekberg; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Railway tracks; degradation; maintenance; tamping; track geometry; planning and scheduling; alignment; Operation and Maintenance Engineering; Drift och underhållsteknik;

    Sammanfattning : The railway infrastructure plays a pivotal role in fostering economic growth and poverty alleviation. Over time, these infrastructures deteriorate due to aging and usage, compromising their functionality. Given their crucial socioeconomic significance and vast scale, ensuring their functionality and availability is paramount. LÄS MER

  5. 4. Mot framtiden på gamla spår? : Regionala intressegrupper och beslutsprocesser kring kustjärnvägarna i Norrland under 1900-talet

    Författare :Fredrik Andersson; Jan Ottosson; Umeå universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Economic history; agenda setting; institutions; Norrland; path dependency; policy making; railways; railway policy; regional interest groups; Sweden; Ekonomisk historia; Economic history; Ekonomisk historia; ekonomisk historia; Economic History;

    Sammanfattning : In this dissertation the construction of two coastal railways, the East Coast Line and the Bothnia Line, in the Norrland region of northern Sweden is used as a case study of how regionally based interest groups are formed, and how they gain access to decision-making processes on a national level. In periods when a number of preconditions were in place, a window of opportunity opened for the coastal railway that the regional elites could exploit. LÄS MER

  7. 5. Modelling the acoustic performance of slab tracks

    Författare :Jannik Theyssen; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; numerical modelling; railway noise; rolling noise; slab track; acoustic optimisation;

    Sammanfattning : Transport is a major contributor to anthropogenic greenhouse gas emissions. Railway transport has a small footprint compared to other means of transport. This is one reason for the construction of new high-speed railway lines world-wide. LÄS MER