Railway applications - Specification and demonstration of reliability, availability, maintainability and safety (RAMS) - Part 2: Systems approach to safety

IEC 62278-2:2025 considers the safety-related generic aspects of the RAMS life cycle and defines methods and tools which are independent of the actual technology of the systems and subsystems.

This document provides:

a) methods for the understanding of the systems approach to safety which is a key concept of IEC 62278;

b) methods to derive the safety requirements and their safety integrity requirements for the system and to apportion them to the subsystems;

c) methods to derive the safety integrity levels (SIL) for the safety-related electronic functions;

d) guidance and methods for the following areas:

1) safety process;

2) safety demonstration and acceptance;

3) organization and independence of roles;

4) risk assessment;

5) specification of safety requirements;

6) apportionment of functional safety requirements;

7) design and implementation;

e) the user of this document with the methods to assure safety with respect to the system under consideration and its interactions;

f) guidance about the definition of the system under consideration, including identification of the interfaces and the interactions of this system with its subsystems or other systems, in order to c