Due to infrastructure constraints in railway transportation system, each disruption can have a very important influence on the system operation. Therefore, it is important to evaluate transportation processes during their designing phase. The structure of timetable is a key factor, that has effect on the transportation system robustness. A large number of possible cases of train scheduling in the timetable makes it currently impossible to deal with this factor. Therefore, an analysis method to evaluate timetable qualities is needed. The paper is focussed on system robustness due to the timetable structure. A robust timetable leading to a robust transportation system is resistant to strokes from undesirable events. In other words, for a robust timetable there is lack of disruption propagation. The challenge arises how to quantify the robustness of the railway transportation system. Thus, the paper discusses issues related to robustness in context of time reserves. Correct dealing with time reserves is a multidimensional issue. Increasing time reserves increases also the robustness. While, the network capacity decreases. That is why ongoing research results will be useful for timetable designing.
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