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Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions and abbreviations
4 Description of track vacancy detection system
5 Safety relevance of parameters
6 Technical track circuit parameters
7 Train based parameters
8 Track based parameters
9 Environmental and other parameters
Annex A (informative) - Scenarios for broken rail
        Relation Track circuit - Broken rail detection
Annex B (informative) - Frequency management
Annex C (informative) - Vehicle Impedance/guidance
        for RST design to support the FM
Annex D (informative) - Example of elements of
        maintenance for existing track circuits
Annex E (informative) - Example of management of
        shunt impedance
Annex F (informative) - Rail to ground impedance
        analyses
Annex G (informative) - Example of mechanical test
        for IRJ
Annex H (informative) - Example of existing requirement
        for the type of sleepers/track structure
Bibliography

BS EN 50617-1