Scope: Identify methodologies, tools and good practices for evaluating optimal mechanisms for marking railway rolling stock with unique identifiers; shape open standards for the Unique Rail Vehicle Identification System (URVIS) application among the relevant stakeholders; set out recommendations and draft protocols for a range of qualifying rolling stock marking systems with unique identifiers; consider and recommend protocols on private and public access to the unique identifier. Transmission of a report to the Working Party on Rail Transport at its seventy-sixth session (November 2022, Geneva)