A simulation model for evaluating the performance of a mass public-transport system (MPTS) is presented in this report. The final prototype was flexible both for constructing an STPM "skeleton" and modelling random events characteristic of this type of system. The final model was a queuing network with other elements such as origin-destination matrices and graphs allowing typical MPTS phenomena to be considered. The simulation model reacted as expected to changes in the parameters and allowed defining and evaluating typical performance measurement for queues (e.g. mean time spent in the system and queue, expected queue length) as well as others representative of these systems.