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The requirements of availability of SBB infrastructure elements are among the highest of mixed traffic railways. It is shown, that there is no alternative to low, non-restrictive intervention limits in case of traditional asset management, without intelligent procedures which supports the calculation of trends, especially the prog¬ nosis of track behavior. The approach of low, non-restrictive intervention limits has the great disadvantage, that the focus of the systematic track maintenance is replaced by focus and managing only of local track irregularities. In case of low limits it is obvious, there are the limits exceeded in many parts of the network. Conversely, railways with lower availability require¬ ments can provide higher, more restrictive limit values, which, if exceeded, can provide an repair intervention but also use speed restrictions immediately. The approach of higher but restrictive limit provides space systematic track maintenance and these is reducing the density of track irregularities. SBBs department of track asset management has calculated, ana¬ lyzed and compared the expected quantity of the approaches of old and new intervention limits. The results are the amount of cumulative length distribution of track repair (tamping) based on the local prognosis over the next 1.5 years The paper shows the additional costs due to the statistical reli¬ ability of the prognosis. These are the costs which are opposed to availability requirements. [ABSTRACT FROM AUTHOR]