Several European rail infrastructure operators have joined together to shape the future of digital interlocking and command and control technology. Within the framework of EULYNX, they are developing common standards for digital interlocking technology. The RCA (Reference CCS Architecture) project is based on this and defines a universal system architecture that extends to the vehicle side. INCYDE is responsible for the organizational management and expert support of the security cluster, which consists of members of the participating companies. In this context, both organizational and technical interoperability-relevant requirements are being designed that will shape the security of the railroad world in the future. These are published in the form of the EULYNX Security Concept and Specification, among others.