In 2017, we have successfully finished a whole series of simulation studies for Stuttgart railway junction. The main objective of those studies was the verification of operational procedures at maintenance centre Stuttgart-Untertürkheim and at surrounding stations with respect to proposed service concept. Besides modelling of train and shunting movements, service activities, such as heavy and light maintenance, repairs in workshop or train parking by personnel, were modelled as well. Various operational scenarios were carefully evaluated with respect to given criteria: train departure delays and timely execution of all defined service activities.