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Rail
Emphasis on quality of track work and a thorough knowledge of the tracks service condition provides for a track which is predictable and reliable. Track geometry condition is a key aspect of this maintenance approach.
The mechanism governing the phenomenon of track deterioration is rather complex. If a track is freshly tamped it is well-known that directly afterwoods, relatively large settlements occur. If every point of the track were to settle by the same amount no irregularities would develop.
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However, these settlements are often far from uniform due to inhomogeneities in support conditions, track structure and load distribution.
This results in differential settlements which lead to the development of irregularities in the wavebands experienced by the rolling stock.
To confine track deterioration, it is of great importance to keep geometrical irregularities as small as possible, starting directly at the renewal, and to confine layer thickness variations during track renewal and ballast cleaning.
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