Maintenance - Articles and news items
Rail industry news / 16 September 2016 /
In a new trial, Keolis has issued its technicians with virtual reality glasses enabling quick and efficient maintenance of the Boston, Mass. commuter rail system.
Rail industry news / 26 August 2016 /
Bombardier Transportation has signed a contract with regional rail authority Landesnahverkehrsgesellschaft Niedersachsen mbH (LNVG) to provide rail vehicle maintenance and service.
Rail industry news / 13 June 2016 /
Deutsche Bahn has signed two memoranda of understanding with China extending its cooperation and presence within the Chinese rail market.
Issue 4 2013 / 1 August 2013 /
The liberalisation of European railways, particularly the free network access of passenger and freight traffic, have a basic influence on the construction of new lines and the maintenance and upgrading of tracks of ÖBBInfrastruktur AG. This article outlines the essential characteristics of track systems including track substructure.
Line layout and cross sections
Operating trains on a line that allows high speeds for passenger trains and low speeds for freight trains requires careful consideration about track alignment design. The maximum allowable values of cant deficiency (Imax = 130mm) and a max. cant excess (Emax = 110mm) enables expectable rail wear and reduced maintenance costs. A maximum gradient of 12.5‰ guarantees a load of 1,000 tonnes per freight train. A minimum radius of 3,000m enables a comfortable train speed of 200km/h, but 250km/h for trains with low axle loads is also possible.
The invention of the ‘Viennese Curve’ – a transition curve calculated for the centre of gravity of a vehicle – reduces lateral track forces and rail wear. In addition, this transition curve guarantees a full compensation of the rate of change of the lateral acceleration at the points of discontinuity – as a result, new and better passenger comfort will occur.
Issue 4 2013 / 1 August 2013 /
Railway diagnostics – in other words a set of activities used to detect the ‘health conditions’ of rail infrastructure – is today an irreplaceable tool to optimise the maintenance of railway networks. It is a crucial area for railway network providers because it guarantees operating safety, prevents failures and directs both human and technological maintenance resources where necessary in an efficient way.
For a few decades now, all major worldwide railway companies have been operating mobile diagnostics tools – from small main – tenance trolleys to trains – which monitor the line in typical operating conditions and are equipped with the latest technological systems to detect, process and analyse data on the infrastructure.
By incrementing the development of diagnostics, Rete Ferroviaria Italiana (RFI) – a company of Gruppo FS Italiane, the Italian network manager – has optimised costs and minimised resource waste by programming maintenance actions. As a matter of fact, the field of ‘on-condition’ maintenance has been enlarged, reducing cyclic maintenance to the minimum.