Proven SIL levels on new rail projects

Many railway systems and components, such as computer-based interlockings, advanced train control systems, axle counters, train braking systems and train management systems, are software-based, using the software to carry out safety and other critical functions. These systems are increasingly being implemented in major Australian and worldwide rail projects where the stakeholders increasingly demand high levels of performance while requiring safety risks to be eliminated or minimised So Far As Is Reasonably Practicable (SFAIRP). Railway projects are also increasingly seeking to use software-based systems that are proven in use, making use of subsystems and components that have been successfully applied in other railways and have achieved a defined Safety Integrity level (SIL). This paper discusses how the top-down development approach required by standards such as EN 50126 can be adapted to use generic, proven subsystems and components to achieve the required level of safety for a project. The process proposed is designed such that the required safety functions are correctly implemented by the resulting system, that the application conditions and constraints of the generic subsystems and components are met, and that the SIL of the subsystems and components is appropriate for the required SIL of the safety functions they are implementing.

Media Info

  • Pagination: 8p. ; PDF
  • Monograph Title: AusRAIL 2018, Rail for a better future, 27-28 November 2018, Canberra, Australian Capital Territory

Subject/Index Terms

Filing Info

  • Accession Number: 01708025
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ATRI
  • Created Date: Jun 18 2019 4:57PM