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The use of Polymeric Electrolyte Membrane Fuel Cells (PEMFC) based power trains as a substitute of Internal Combustion Engines (ICE) in transportation has been demonstrated but still requires both technical development of components and their integration in the system. One of the major technical challenges for automotive application is the system response during rapid variations of operative conditions, which is one of the most significant elements concurring in determining the vehicle drivability (i.e. the power train capability to allow rapid transient phenomena). The power train response under transient conditions depends on the combined action of all the system components performances. This behaviour is still more complicated when hydrogen has to be produced on board and the reformer response has to be taken into account.