National safety authorities involved in the supervision of a railway undertaking operating in more than one Member State shall coordinate their approach to supervision to ensure that the safety management system of the railway undertaking is effective and covers all relevant activities. The coordination activities shall involve agreement on what information to share between national safety authorities in order to ensure a common approach to supervision of the relevant railway undertaking. It shall also include sharing information on the supervision strategy and plan or plans of the national safety authorities concerned, including any relevant outcomes, to enable a joint approach to dealing with non-compliance.

National safety authorities shall develop cooperation arrangements with national investigation bodies, certification bodies for entities in charge of maintenance and other competent authorities in order to share information and to coordinate their response to any failure to comply with the safety-related regulatory framework.