University of Twente Student Theses


Influence of different sources of variation on the capacity of an NS service location

Zomer, V. (2019) Influence of different sources of variation on the capacity of an NS service location.

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Abstract:The Dutch railway system is becoming more crowded, resulting in a need for more train units. This also means that more train units need to be treated at the service locations of the Nederlandse Spoorwegen (NS). To handle this increase, the NS wants to make better use of the available resources. This research investigates the influence of certain sources on the capacity of service locations. The sources investigated are the arrival process, allowing coupling and decoupling and the topology of a service location. Ultimately, the location layout turned out to have a lot of influence. Therefore the arrival process and allowing coupling and decoupling are also investigated when specified for the location topology. For these sources, survival functions are made based on model data from the NS. Those survival functions show the chance that no solution is found (chance of failure) for a work package per number of train units. Namely, in a work package a certain number of train units are planned. The chance of failure increases while increasing the number of train units in a work package, since it is harder to find solutions for work packages in which less train units need to be handled. These survival functions are made based on the Turnbull Algorithm and the Product Limit Method. Once the survival functions of different scenarios of the sources are composed, influence is determined by testing those survival functions on significant differences. This is done by executing the Kolmogorov Smirnov test. More information about the cause of impact is obtained by comparing the medians and the variances of the survival functions. The source of variation in median in this research was the arrival process, especially when specified per service location layout. The sources of variation in variance of this research were the topology of the locations, the arrival process at the a carousel layout and allowing coupling and decoupling at a shuffleboard layout.
Item Type:Essay (Bachelor)
Faculty:ET: Engineering Technology
Subject:56 civil engineering
Programme:Civil Engineering BSc (56952)
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