The EULOGIX (ARGOS) methodology applies MBSE principles to modernize railway signaling and traffic management. By using digital system models to support design, simulation, verification, and lifecycle management, ARGOS enables better collaboration, improved traceability, and faster decision-making across complex railway projects. This methodology helps optimize system reliability, safety, and maintenance while supporting the transition toward intelligent, interoperable, and future-ready rail infrastructure. It is based on CENELEC EN50126 standard.