ENV 50129 : DRAFT 98

Introduction
1. Scope
2. Normative references
3. Definitions and abbreviations
    3.1 Definitions
    3.2 Abbreviations
4. Overall framework of this standard
5. Conditions for safety acceptance and approval
    5.1 The Safety Case
    5.2 Evidence of quality management
    5.3 Evidence of safety management
    5.4 Evidence of functional and technical safety
    5.5 Safety acceptance and approval
Figures
1 Scope of CENELEC railway standards
2 Structure of this standard (ENV 50129)
3 Structure of Safety Case
4 Example of system life-cycle
5 Example of design and validation portion of system
    life-cycle
6 Arrangements for independence
7 Structure of Technical Safety Report
8 Safety acceptance and approval process
9 Examples of dependencies between Safety Cases/Safety
    Approvals
Annexes
A (normative) Safety Integrity Levels
B (normative) Additional technical requirements
C (normative) Identification of hardware component failure
               modes
D (informative) Supplementary technical information
E (informative) Techniques and Measures for safety-related
                 electronic systems for signalling for the
                 avoidance of systematic faults and the
                 control of random and systematic faults
F (informative) Bibliography

Applies to safety-related electronic systems (including subsystems and equipment) for railway signalling applications. Intended mainly to apply to "fail-safe" and high-integrity" systems rather than medium or low-integrity systems or in marshalling yards where points are moved as vehicles approach.