Wessex LTPP Route Study Guildford – Station Capacity Pre-GRIP Feasibility Report - Addendum 29 November 2016 Issue 2.6 Addendum Contents 1. Executive Summary .............................................................................................................. 7 2. Background ........................................................................................................................... 8 2.1 Future Train Service Aspirations ................................................................................... 9 3. Methodology ........................................................................................................................ 12 4. Constraints .......................................................................................................................... 13 4.1 Existing Station Overview ............................................................................................ 13 4.2 Flooding Risk ............................................................................................................... 14 4.3 Buried/Other Services .................................................................................................. 15 4.4 Land Ownership/Development .................................................................................... 15 4.5 Environmental/Heritage considerations ....................................................................... 18 4.6 Ground Conditions ....................................................................................................... 18 4.7 Threats & Opportunities ............................................................................................... 18 4.7.1 Solum Development ....................................................................................... 18 4.7.2 Farnham Road Bridge .................................................................................... 20 4.7.3 North Downs Line Electrification .................................................................... 21 5. Addendum Options for Increasing Guildford Station Capacity ...................................... 22 5.1 Options Overview ........................................................................................................ 22 5.1.1 Option 1 – New bay platform P0 to east ........................................................ 22 5.1.2 Option 2 – New island platform to east .......................................................... 22 5.1.3 Option 3 – New viaduct .................................................................................. 22 5.1.4 Option 4 – Terminating platform at Guildford’s London Road Station ........... 23 5.1.5 Option 5 – Extend platform P2 to the south and construct a new island platform to the north ....................................................................................... 23 5.1.6 Option 6 – Construct a raised platform P0 above existing platforms P1 & P2 on the east side of the station. ....................................................................... 23 5.1.7 Option 7 – Track re-configuration to north and a new side platform P0 ........ 23 5.2 Options Summary ........................................................................................................ 25 5.3 Option 1 – New bay platform P0 to East ...................................................................... 26 5.3.1 Option 1A – New bay platform P0 to east with reduced platform P1/P2 width26 5.3.2 Construction Considerations .......................................................................... 26 5.3.3 Permanent Way Considerations .................................................................... 27 5.3.4 General Items ................................................................................................ 27 5.3.5 Bill of Quantities ............................................................................................. 27 5.4 Option 2 ....................................................................................................................... 31 5.4.1 Option 2A ....................................................................................................... 31 5.4.2 Construction Considerations .......................................................................... 32 5.4.3 Permanent Way Considerations .................................................................... 32 5.4.4 General Items ................................................................................................ 32 5.4.5 Bill of Quantities ............................................................................................. 33 Guildford Station – Station Capacity – Addendum version 2.6 29th November 2016 Network Rail Infrastructure Projects - Strictly Private and Confidential 5.5 Option 3 ....................................................................................................................... 36 5.5.1 Construction Considerations .......................................................................... 36 5.5.2 Permanent Way Considerations .................................................................... 37 5.5.3 General Items ................................................................................................ 37 5.5.4 Bill of Quantities ............................................................................................. 38 5.6 Option 4 ....................................................................................................................... 41 5.7 Option 5 ....................................................................................................................... 41 5.8 Option 6 ....................................................................................................................... 41 5.9 Option 7 ....................................................................................................................... 42 5.9.1 Construction Considerations .......................................................................... 43 5.9.2 Permanent Way Considerations .................................................................... 43 5.9.3 General Items ................................................................................................ 44 5.9.4 Bill of Quantities ............................................................................................. 44 6. General Construction Considerations for all options ..................................................... 47 6.1 Construction Methodology ........................................................................................... 47 6.2 Construction Programme ............................................................................................. 47 7. Electrical System ................................................................................................................ 49 7.1 Background .................................................................................................................. 49 7.2 Intervention .................................................................................................................. 49 7.3 25kV OLE Electrification .............................................................................................. 49 7.4 750V DC Electrification ................................................................................................ 51 7.5 Specific Areas to Note ................................................................................................. 52 7.5.1 Guildford ........................................................................................................ 52 7.6 Power Supply ............................................................................................................... 52 7.6.1 Security of Power Supply ............................................................................... 53 7.7 Options 1 and 2 Specific DC Electrification Issues ...................................................... 54 7.8 Option 3 Specific DC Electrification Issues .................................................................. 54 7.9 Options 4 to 7 Specific DC Electrification Issues ......................................................... 55 7.10 Signalling ..................................................................................................................... 56 7.10.1 Operational Requirements Specification ........................................................ 56 7.10.2 SSI Interlocking capacity ................................................................................ 56 7.10.3 Ergonomics .................................................................................................... 56 7.10.4 Layout, Signal Positioning and Sighting ......................................................... 56 7.10.5 Train Dispatch ................................................................................................ 56 7.10.6 DC Immunity and EMC .................................................................................. 56 7.10.7 Train Detection ............................................................................................... 56 7.10.8 Point Operating Equipment ............................................................................ 57 7.10.9 Train Protection and Warning System (TPWS) ............................................. 57 7.10.10 Signalling Maintenance and “PRAMS” ........................................................... 57 7.10.11 Summary .......................................................................................................