1. INTERFACING ETCS WITH LEGACY CC-SYSTEMS TRACK - SIDE

2. 2 NEED FOR MIGRATION Elimination of National Systems and their replacement with ETCS – In most cases coming to the end of their life cycle. Two different strategies: – All train first, then trackside straight to ETCS in a big – bang. – Trackside dual (or triple fitted) as an overlay, then gradual fitting of trains. Need to interface to National Systems. Need to replace or enhance the existing Signalling Systems

3. 3 MIGRATION STRATEGIES GRADUAL MIGRATION – Maintain the existing ATP National System – Trains equipped with ETCS STM national system – Automatic switch over can be performed (national function) Full ATP national system – No Automatic switch over. Only under special design of dedicated interface LEVEL 2- LEVEL 1 NATIONAL

4. 4 MIGRATION STRATEGIES GRADUAL MIGRATION – It allows progressive ETCS implementation On board Trackside – ATP national system as a fall back during a period as desired – It allows a mixed traffic of equipped and non equipped trains – No need of special interface between ETCS/ATP track side Eurobalises for beginning and end of ETCS territory Existing National SystemETCS L1 or L2

5. 5 MIGRATION STRATEGIES Spanish experience – Trains equipped with ETCS L1 and L2 and complete independent ASFA national system (no STM) ASFA National System ETCS L1 ETCS L2

6. 6 INTERFACES Interfaces ETCS L1, L2 / existing signalling systems – Relay type interlockings – Line side signals – Electronic interlockings – CTC ETCS level 2/Level 1 RBC EURO- BALISE LEU Interlocking LEU EURO- BALISE

7. 7 INTERFACES

8. 8 ETCS/SIGNALLING INTERFACES ETCS level 1 – Relay type interlocking/Track side elements LEU, discrete Interface with parallel inputs Direct wiring to any interlocking or signal aspects LEUs centralized at relay room (1) LEUs line side installed (2) Relatively simple interface No LEUs interconnection Max. speed determined by line side signals No centralized TSR´s LEU Interlocking SIGNAL LAMPS I/F 1 2

9. 9 INTERFACES ETCS level 1 – Relay type Interlocking – LEU Networked version TCP/IP suitable for fibre optic comms. links to interlocking and Control Centre Temporary Speed Restrictions direct from Control Centre – Remote Maintenance and Diagnosis – Max. speed can be higher 4 Balises / LEU LEU LEUs CONCENTRATOR INTERLOCKING LEU TDM PARALLEL I/O

10. 10 INTERFACES ETCS level 1 – Electronic Interlocking – LEU Networked version – Non standard interface Manufacturer's owned. LEU LEUs CONCENTRATOR INTERLOCKING LEU TCP/IP

11. 11 INTERFACES ETCS level 2 – Relay type Interlocking RBC Interlocking VITAL PARALLEL INPUTS TDM Safety Interface Vital parallel I/O Transmission Digital module Serial vital comms protocol Non standard Manufacturer's owned Technically feasible Operationally not advisable Maintenance Investment Lifecycle

12. 12 INTERFACES ETCS level 2 – Electronic Interlocking – Serial Interface – Vital communications protocol – Non standard interface Manufacturer's owned Signalling LAN RBC INTERLOCKING

13. 13 INTERFACES ETCS level 2 – Electronic IL. Spanish experience – Westrace comms protocol has been implemented into Alcatel´s RBC in Spanish HS lines: La Sagra – Toledo; Segovia – Valladolid; Lérida – Barcelona – Invensys RBC comms protocol has been implemented into Alcatel´s Intersig interlocking in Córdoba – Málaga HS line – Westrace comms protocol has been implemented into Siemens CBTC in L9 driverless Barcelona Metro Interlocking protocol RBC Interlocking RBC protocol RBC Interlocking

14. 14 INTERFACES ETCS Level 2 – Level 2. Different manufacturers – RBC - RBC Safe Communication Interface is being specified within UNISIG. Signalling LAN RBC UNISIG SUBSET – 039. FIS for RBC - RBC handover. UNISIG SUBSET – 098. RBC – RBC Safe Comm. Interface. UNISIG SUBSET – 099. RBC – RBC Test specification for Safe Comm. I/F

15. 15 INTERFACES ETCS level 2 – Level 1 – Crossing from Level 2 to Level 1 is performed automatically on board (national function) – Eurobalises marking the border of Levels 1 an 2 ETCS L1ETCS L2

16. 16 INTERFACES ETCS L1 ETCS L2 ETCS level 2 – Level 1 – L2 overlapping L1 – L1 used as fallback system – Automatic switch over as national function

17. 17 INTERFACES ETCS level 1 / level 2 - CTC INTERLOCKING CLC hot stand by LEU Eurobalises ETCS LEVEL 1 EQUIPMENT ERTMS – CENTRAL EQUIPMENT RBC JRU LOCAL OPERATION LEVEL 2 LEVEL 1 ETCS comms Interface CTC ETCS Central Control ETCS comms protocol Manufacturer's owned SIL 2 comms

18. 18 CONCLUSIONS GRADUAL MIGRATION – Maintain the existing ATP National System during migration period ETCS Level 1 – Advantages Overlays existing signalling with minimal change GSM-R not required Interoperability now well proven On-board is compatible with higher levels (add radio) – Disadvantages No capacity improvement (can be negative unless in-fill is fitted) High Cost (Line side Electronic Unit + in-fill+ cabling) Trackside does not migrate easily to higher levels ETCS Level 2 with SIGNALS – Advantages Overlays on existing train protection Balises become fixed (no trackside electronics) – Disadvantages GSM-R is required Radio coverage may need to be improved over voice

19. 19 CONCLUSIONS ETCS Level 2 WITHOUT SIGNALS – Advantages Cab-signalling system with cost savings Significant capacity increases through variable train detection sections – Disadvantages All trains need to be fitted Radio based cab-signalling of this complexity is new to the mainline railway industry Fall back system requested? – High density traffic lines – Low traffic lines Signalling Systems – Cost effective solutions/technical feasibility Gradual enhancement Replacement