White Paper

Railway Signalling Systems

The main function of an interlocking system is to ensure that trains operate safely by preventing route conflicts. This includes controlling things like signal and track switches. To ensure that it is fit for purpose, any interlocking system must meet international standards for railway systems and offer the highest levels of safety, reliability, maintainability and availability.


In this white paper you will learn about:

  • The processes behind the effective development of interlocking systems
  • Different types of interlocking systems, including Computer Based Interlocking (CBI) systems and Solid State Interlocking (SSI) systems
  • The design requirements of modern interlocking systems
  • Reliability, Availability, Maintainability and Safety (RAMS) in interlocking systems
  • Applying industry standards and the safety assessment process to interlocking systems