EIM consider it as an important topic for achieving the benefits of interoperability and generating growth of the European railway network. This position paper reflects, and brings to the attention of the European Railway Agency (ERA) and EC, the view of EIM on the roles and responsibilities of infrastructure managers (IMs) in the various processes linked to vehicle authorisation and operation. The position paper also proposes further harmonisation topics which would greatly facilitate the efficient acceptance process and use of rolling stock across the EU.