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This paper presents the some issues related to modeling of hydrogen fuel-cell based propulsion systems and the main characteristics of the corresponding simulation program developed in Matlab-Simulink™ environment by the authors. Although several hybrid vehicle simulators are available today, often researchers prefer to create programs of their own, to pursue specific pursues. The authors have gone in this direction, and with this paper they intend to share this experience with readers wanting to do a similar job, hoping they can find useful hints to direct their activity. The paper shows therefore the main issues to be tackled when creating hybrid vehicle simulation programs in general, and fuel-cell based in particular, and gives some details on individual component modeling.