DIFFERENT maintenance strategies are best assessed in relation to their effect on track geometry durability, the longevity of track materials, the frequency and type of maintenance operations, and in accordance with findings resulting from research. The comparison LCC process is then performed on this basis.
The method has proven to be successful with Austrian Federal Railways (0BB) where LCC investigations were carried out for different track maintenance strategies and then put into practice. Successes concerned the application of the Dynamic Track Stabiliser to extend maintenance cycles; the application of GPS technology for track surveying; and the use of formation rehabilitation machines to improve the subsoil or preventive rail grinding immediately after tamping.
The average overall annual costs for track handling between 30,000 and 50,000 gross tonnes/day/direction is about 35,000 [euro]/km. Optimising track laying and track maintenance is therefore a significant challenge. The aim of developing strategies and evaluation models is the optimisation of the time-related quality curve of the permanent way, and not the short-term technical-economic optimisation of the correction of a given track condition.
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