Europe's Rail - Enabling Continuous Evolution of Safety-Critical Railway Systems

Railway systems are becoming increasingly modular, software-driven, and interconnected, while assessment and approval processes remain largely based on rigid and sequential lifecycle assumptions. At the same time, operators and manufacturers face growing pressure to deploy software corrections, cybersecurity updates and functional evolutions more frequently and at lower cost. This creates a growing gap between the operational need for continuous evolution and the ability of current assurance and certification approaches to support it efficiently.

Within Europe’s Rail - System Pillar - PRAMS, we are developing a pragmatic framework to manage the evolution of safety-related modular systems across the full lifecycle. The work addresses not only assessment activities, but also impact analysis, software development, testing, integration, and change management processes.

The proposed approach aims to avoid systematically restarting complete certification activities for every modification. Instead, it introduces proportional engineering and assurance activities based on the significance, scope, and impact of evolutions. The objective is to support faster and more predictable system updates while maintaining the required level of safety and interoperability.

The presentation will also discuss the limitations of current railway standards regarding software maintenance and evolution management, especially for long-lifecycle systems integrating reusable components, COTS technologies, virtualization platforms, and cybersecurity updates.

Finally, the presentation will introduce ongoing proposals developed within Europe’s Rail to better integrate RAMS, cybersecurity, and lifecycle continuity into a coherent framework adapted to continuously evolving safety-critical railway systems.