Allvarliga funktionsstörningar i baninfrastrukturen: beräkning av effekter på tågtrafiken

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Mats Wiklund

The track infrastructure installations of the railway transport system are at times subjected to stresses which give rise to such serious faults or damage that traffic must be stopped, or cause such serious disturbances that trains must be cancelled. Examples are falls of overhead contact lines, fire in interlocking systems or flooding of the track bed. It is obviously impossible to create a system where such situations never occur, but an attempt can be made to allocate operational and maintenance work in such a way that the probability of such occurrences is reduced to a minimum on those track installations where the impact in the form of comprehensive traffic disturbances is greatest. Extensive damage to the interlocking system of the rail transport system causes comprehensive disturbances. One example of such damage which gave rise to serious consequences is when the interlocking system at Jaerna station burned down the week after midsummer in 2000. A microsimulation tool for rail traffic, RailSys, which had been developed in Germany, was used to simulate the consequences of the fire. Simulations were also made for rail traffic flows both higher and lower than those that applied after the fire. Lowering of the highest permitted speed through a track infrastructure installation is one example of the reduction in potential capacity. The delays which then occur can in some situations be recouped through somewhat higher speeds on other parts of the system. Sometimes this is not possible, but the delays which nevertheless occur may be so small that all planned train movements can be carried out. In a lot of circumstances, however, delays are so extensive that rolling stock assignment is affected and trains must be cancelled. Alternatively, the potential capacity may become so low that all planned train movements cannot be carried out. When faults or damage occur to the signalling system, the highest permitted speed is sometimes reduced to 40 km/h. This may also occur when the bearing strength of the permanent way is reduced or when the track is in a bad condition. The authors have studyied how traffic is affected when the highest permitted speed is reduced to 40 km/h on a number of sections of the Svealand Line between Nykvarn and Eskilstuna in Soedermanland.

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