Swiss Federal Railways

Summary

Swiss Federal Railways (Schweizerische Bundesbahnen, SBB; Chemins de fer fédéraux suisses, CFF; Ferrovie federali svizzere, FFS) is the national railway company of Switzerland. It is usually referred to by the initials of its three official names – defined by federal law SR/RS 742.31 (SBBG/LCFF/LFFS) Art. 2 §1 – in German, French, and Italian, either as SBB CFF FFS, or used separately. The official English abbreviation is "SBB". While the official Romansh name, Viafiers federalas svizras (VFF) is used in federal documents and laws and Romansh-language media, it is not used by the SBB. The company, founded in 1902, is headquartered in Bern. It used to be a government institution, but since 1999 it has been a special stock corporation whose shares are held by the Swiss Confederation and the Swiss canto

Official source

https://en.wikipedia.org/wiki/Swiss_Federal_Railways

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Modelling degradation processes of switches & crossings for maintenance & renewal planning on the Swiss railway network

Willem-Jan Zwanenburg

Approximately 25 percent of the budget for the maintenance and renewal of railway tracks –in Switzerland more than a billion Swiss Francs– is used for the switches (points) and crossings (S&C). While in the mean time the budget expenditure for the maintenance and renewal of plain track is optimized with e.g. the help of decision support systems, for S&C this optimisation stays rather rudimentary. One of the identified causes thereof is the lack of insight in the degradation and deterioration process of S&C. This study therefore combined several databases of the Swiss Federal Railways (SBB CFF FFS). Statistical analyses are carried out on them to retrieve the lifetime expectancy of complete railway switches (points) & crossings and their respective components, e.g. point rails, stock rails, frog. The expected lifetimes are attributed to different parameters which influence the speed of geometrical degradation or wear of the material, e.g. total train loads (expressed in cumulative tonnages), axle loads, the main direction of the trains, the speed and the quality of the foundation.

EPFL2009

Switches and crossings (S&C) form an important asset of modern day railways. Current Decision Support Systems for track maintenance and renewal however do not provide help on maintenance and renewal management of S&C, due to the lack of understanding of the degradation and deterioration processes of S&C often combined with an unsuitable way of data collection. This project will focus on understanding and modelling the degradation and deterioration processes of complete S&C and its components (ballast, sleepers, rail, frogs/crossings, sliding chairs, half set of switches etc) on geometrical scale and with regard to material deterioration. In close cooperation with the Swiss Federal Railways (SBB) and – if possible – other networks through the International Union of Railways (UIC), information will be gathered on S&C deterioration in combination with information on the trains which run over the S&C, the number of settings, axle loads, speeds, quality of the subsoil etc. The end product will consist of models and a computer tool which allow future prediction of maintenance and renewal needs of S&C on network, regional and local scale.

2006

Degradation Processes and Wear of Railway Switches and Crossings: The Swiss Experience

Willem-Jan Zwanenburg

Using databases of the Swiss Federal Railways (SBB), statistical analyses are carried out on the expected lifetime of railway switches (points) and crossings (components). They are attributed to different parameters which influence the speed of degradation or wear.

2007