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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 104
PROCEEDINGS OF THE SECOND INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE
Edited by: J. Pombo
Paper 47

Trackbed Evolution on the French Railway Network

N. Calon1, A. Robinet1 and V.N. Trinh2

1Engineering Department, SNCF, Paris, France
2Systra, Paris, France

Full Bibliographic Reference for this paper
N. Calon, A. Robinet, V.N. Trinh, "Trackbed Evolution on the French Railway Network", in J. Pombo, (Editor), "Proceedings of the Second International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 47, 2014. doi:10.4203/ccp.104.47
Keywords: tracked, railways, interlayer, performance.

Summary
The aim of this paper is to show the evolution of the trackbed design of railway platforms from the 19th century to the present. In France, there are more than 30,000 kilometers of operational classic lines in use and 2,000 kilometers of high speed lines (HSL). Initially, the classic lines were built without standards and the platform appeared by interpenetration of ballast and subgrade, creating an intermediate layer. For their part, the HSL are built according to standards defining the mechanical characteristics of the products used and the thickness of the layers. In this paper, first the difference between classical lines and HSL design are describe. Then the main developments, for new lines, in term of design (diminution of thickness of the layers) and products (utilization of treated materials) and for the track bed investigations on the old lines, are presented. Finally the paper focuses on the impact of those developments on track maintenance.

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