Abstract: The certification of a rail vehicle according to European regulations, Technical Specifications for Interoperability, European Standards and national safety rules represents a significant element of both vehicle cost and time to market. Indeed, a large part of vehicle certification mandates testing for safety, performance and infrastructure compatibility. The new EN standards together with CR/HS RST and INS TSI define test conditions and limit values for tests for acceptance of running safety parameters. DynoTRAIN, which stands for Railway Vehicle Dynamics and Track Interactions Total Regulatory Acceptance for the Interoperable Network, will contribute to the practical implementation of interoperability of railway systems across Europe by checking for inconsistencies and "open points" in the existing acceptance criteria and by proposing revisions of acceptance critera in European standards and resolutions to close relevant "open points" in the TSI. The project aims at decreasing the costs associated with certification without reducing the safety level to enhance the competitiveness of rail traffic. As for the sister projects AeroTRAIN and PantoTRAIN, the objective for DynoTRAIN is to propose an innovative methodology via computer simulation / virtual homologation.