INTERFACING ETCS WITH LEGACY CC-SYSTEMS

TRACK - SIDE

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

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

GSM-R

EVC

ETCS-MMI

Radio NAT. EVC ETCS

N1 + N2

BTM LEVEL 2-

LEVEL 1

NATIONAL

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 System

ETCS L1 or L2

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

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

INTERFACES

Compiler LTVs

Interlocking

LEU 1

LEU N

LEU 15

Balises LEU 1

BalisesLEU N

BalisesLEU 15

Local Operation ERTMS

local operation

System Aid Maintenance

ERTMSCentral Control

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

LEU

LEU

LEU

LEU

LEU

LEU

LEU

LEU

LEU

LEU

Interlocking

SI

GN

ALLA

MPS

I/F

1 2

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

LEU

LEU

LEU

LEU

LEU

LEU

LEUs CONCENTRATOR

INTE

RLO

CKIN

G

LEU

LEU

LEU

LEU

TDM

PARA

LLEL

I/O

10

INTERFACES

• ETCS level 1 – Electronic Interlocking– LEU Networked version– Non standard interface

• Manufacturer's owned.

LEU

LEU

LEU

LEU

LEU

LEU

LEU

LEUs CONCENTRATOR

INTE

RLO

CKIN

G

LEU

LEU

LEU

LEU

TCP/IP

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

INTERFACES

• ETCS level 2 – Electronic Interlocking– Serial Interface– Vital communications protocol– Non standard interface

• Manufacturer's owned

SignallingLAN

RBC

INTE

RLO

CKIN

G

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

INTERFACES

• ETCS Level 2 – Level 2. Different manufacturers– RBC - RBC Safe Communication Interface is being specified

within UNISIG.

Signalling

LAN

RBC 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

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

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

INTERFACES

• ETCS level 1 / level 2 - CTC

INTERLOCKINGCLC

hot stand by

LEU

Eurobalises

ETCS LEVEL 1 EQUIPMENT

ERTMS – CENTRAL EQUIPMENT

RBC

JRU

LOCALOPERATION

LEVEL 2

LEVEL 1

ETCS commsInterface

CTC ETCSCentral Control

ETCS comms protocolManufacturer's owned

SIL 2 comms

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

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