Cardiff to Swansea Journey Time Improvement GRIP1 Intervention Study Cardiff to Swansea Journey Time Project Name: Improvement Document Ref: 161034‐NRD‐G1‐CDSW‐REP‐EMF‐100000 Issue: P01 GRIP Stage: 1 Contents 1. Document Control ......................................................................................................... 5 2. Executive Summary ...................................................................................................... 6 3. Introduction ................................................................................................................... 7 3.1 Scope of Works .................................................................................................................................. 7 3.2 Methodology of this study .................................................................................................................. 7 4. Signalling Review ....................................................................................................... 10 4.1 Background ...................................................................................................................................... 10 4.2 Signalling Scope of alteration ........................................................................................................... 10 4.2.1 Signal positioning and sighting .......................................................................................... 11 4.2.2 Train Protection ................................................................................................................. 11 4.2.3 Loops and Junctions ......................................................................................................... 11 4.2.4 Level Crossings ................................................................................................................. 12 4.2.5 Stations with permissive movements ................................................................................ 13 4.2.6 Point Operating Equipment ............................................................................................... 13 4.2.7 Train Detection Equipment ................................................................................................ 13 4.2.8 Interlocking - Lineside equipment compatibility ................................................................ 13 4.2.9 Interlocking – Alterability ................................................................................................... 13 4.2.10 Power supplies .............................................................................................................. 14 4.3 Proposed Optimised Speed Profile .................................................................................................. 14 5. Track Review ............................................................................................................... 15 5.1 Assumptions and Exclusions ........................................................................................................... 15 5.2 Third (3rd) Way Analysis ................................................................................................................... 16 5.3 Track interventions ........................................................................................................................... 17 5.3.1 Intervention Methodology .................................................................................................. 17 File Ref: 161034-NRD-G1-CDSW-REP-EMF-100000 Issue No: P.01 Page 2 of 59 5.3.2 Summary of interventions ................................................................................................. 17 5.4 Track component review .................................................................................................................. 19 5.5 Gauging review ................................................................................................................................ 20 6. Civils Review ............................................................................................................... 21 6.1 Assumptions and Exclusions ........................................................................................................... 22 6.1.1 Assumptions ...................................................................................................................... 22 6.1.2 Exclusions ......................................................................................................................... 22 6.2 Civils Methodology ........................................................................................................................... 23 6.2.1 Culverts ............................................................................................................................. 25 6.2.2 Underbridges ..................................................................................................................... 26 6.3 Civils Interventions ........................................................................................................................... 26 6.3.1 Speed Increase Interventions ........................................................................................... 26 6.3.2 Impact of Track Interventions ............................................................................................ 29 6.4 Headline Results .............................................................................................................................. 30 6.5 Lonlas Tunnel ................................................................................................................................... 34 6.6 Conclusion ........................................................................................................................................ 34 6.7 Next Steps ........................................................................................................................................ 35 7. Geotechnical Review .................................................................................................. 36 7.1 Assumptions ..................................................................................................................................... 36 7.2 Assessment Approach ..................................................................................................................... 37 7.2.1 Risk Category .................................................................................................................... 45 7.3 Geotechnical Interventions ............................................................................................................... 45 7.3.1 Regrade / Batter ................................................................................................................ 45 7.3.2 Retaining Structures .......................................................................................................... 46 7.3.3 Superficial Deposits .......................................................................................................... 46 7.4 Conclusions ...................................................................................................................................... 47 7.4.1 EHC ................................................................................................................................... 47 7.4.2 Risk Category .................................................................................................................... 47 7.5 Next Steps ........................................................................................................................................ 47 File Ref: 161034-NRD-G1-CDSW-REP-EMF-100000 Issue No: P.01 Page 3 of 59 8. Appendices .................................................................................................................. 48 Appendix A1: ............................................................................................................................................... 49 Appendix B1: ............................................................................................................................................... 50 Appendix B2: ............................................................................................................................................... 51 Appendix B3: ............................................................................................................................................... 52 Appendix B4: ............................................................................................................................................... 53 Appendix C1: ............................................................................................................................................... 54 Appendix C2: ............................................................................................................................................... 55 Appendix D1: ............................................................................................................................................... 56 Appendix E1: ............................................................................................................................................... 57 Appendix E2: ............................................................................................................................................... 58 File Ref: 161034-NRD-G1-CDSW-REP-EMF-100000 Issue No: P.01 Page 4