Computational Technology Resources - CCP

E. Castillo^1,2, Z. Grande², P. Moraga^2,3, M. Nogal⁴ and A.J. O'Connor⁴

¹Royal Academy of Engineering, Spain
²Department of Applied Mathematics and Computational Sciences, University of Cantabria, Santander, Spain
³Pontificia Universidad Católica de Valparaíso, Chile
⁴Trinity College, Dublin, Ireland

Keywords: timetable optimization, alternate double-single-track.

Summary

Multiple track lines are the only satisfactory solution for high speed railway lines when demand is high. However, in several countries double track high speed lines are being built for low demand lines, which are very expensive and inadequate solutions. This paper presents alternate double-single-track (ADST) lines as an alternative to double-track lines. The idea consists of using single-track where the infrastructure is very expensive (tunnels and viaducts) and double-track where it is cheaper (smooth orography) combined with small changes in departure times so that trains may cross in the double-track segments with no reduction in travel times. The solution is shown to be very efficient for intermediate traffic demands and the construction and maintenance costs are substantially reduced (close to 40%). A linear programming program is given that (1) decides the optimal sequence of single and double-tracks to be constructed and (2) optimizes the timetables for a given demand. The method can also be applied to combine high speed tracks with conventional existing tracks, where the conventional ones are used mainly for train crossing and circulation of slow and freight trains. These solutions produce very important savings (close to 90%) with very reasonable travel times. The lines Palencia-Santander in Spain, the Santiago-Valparaíso-Viña del Mar in Chile and the Dublin-Belfast in Ireland are used to illustrate both proposals and to demonstrate that they are very interesting alternatives in some practical cases.

purchase the full-text of this paper (price £22)

go to the previous paper
go to the next paper
return to the table of contents
return to the book description
purchase this book (price £85 +P&P)

	Computational & Technology Resources an online resource for computational, engineering & technology publications
	not logged in - login
Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 110 PROCEEDINGS OF THE THIRD INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE Edited by: J. Pombo Paper 283 Alternate Double Single Track Proposals for Low Demand High-Speed Railway Lines E. Castillo^1,2, Z. Grande², P. Moraga^2,3, M. Nogal⁴ and A.J. O'Connor⁴ ¹Royal Academy of Engineering, Spain ²Department of Applied Mathematics and Computational Sciences, University of Cantabria, Santander, Spain ³Pontificia Universidad Católica de Valparaíso, Chile ⁴Trinity College, Dublin, Ireland doi:10.4203/ccp.110.283 purchase the full-text of this paper Full Bibliographic Reference for this paper E. Castillo, Z. Grande, P. Moraga, M. Nogal, A.J. O'Connor, "Alternate Double Single Track Proposals for Low Demand High-Speed Railway Lines", in J. Pombo, (Editor), "Proceedings of the Third International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 283, 2016. doi:10.4203/ccp.110.283 Keywords: timetable optimization, alternate double-single-track. Summary Multiple track lines are the only satisfactory solution for high speed railway lines when demand is high. However, in several countries double track high speed lines are being built for low demand lines, which are very expensive and inadequate solutions. This paper presents alternate double-single-track (ADST) lines as an alternative to double-track lines. The idea consists of using single-track where the infrastructure is very expensive (tunnels and viaducts) and double-track where it is cheaper (smooth orography) combined with small changes in departure times so that trains may cross in the double-track segments with no reduction in travel times. The solution is shown to be very efficient for intermediate traffic demands and the construction and maintenance costs are substantially reduced (close to 40%). A linear programming program is given that (1) decides the optimal sequence of single and double-tracks to be constructed and (2) optimizes the timetables for a given demand. The method can also be applied to combine high speed tracks with conventional existing tracks, where the conventional ones are used mainly for train crossing and circulation of slow and freight trains. These solutions produce very important savings (close to 90%) with very reasonable travel times. The lines Palencia-Santander in Spain, the Santiago-Valparaíso-Viña del Mar in Chile and the Dublin-Belfast in Ireland are used to illustrate both proposals and to demonstrate that they are very interesting alternatives in some practical cases. purchase the full-text of this paper (price £22) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £85 +P&P)
Back to top	©Civil-Comp Limited 2023 - terms & conditions