The project develops an advanced train positioning solution combining GNSS, 5G, and  onboard sensors to ensure safe, accurate, and reliable localization, even in challenging  environments like tunnels or urban areas. Its main goal is a high-integrity system  compatible with future railway communications (FRMCS), enabling applications such as  virtual balises, moving block operations, and enhanced traffic management. The approach  includes designing a resilient Advanced Safe Train Positioning (ASTP) architecture, integrating multiple data sources, redundant processing, and continuous monitoring. Key  activities cover system design, technology integration, algorithm development, prototype  implementation, and validation. Expected impacts include safer operations, reduced  trackside dependency, higher resilience, and support for digital and autonomous rail  transport.