Commission Decision of 25 January 2012 on the technical specification for interoperability relating to the control-command and signalling subsystems of the trans-European rail system (notified under document C(2012) 172) (Text with EEA relevance) (2012/88/EU) (repealed)

2. SUBSYSTEM DEFINITION AND SCOPE

2.1. Introduction

The Control-Command and Signalling Subsystems are defined in Annex II to the Railway Interoperability Directive as ‘all the equipment required to ensure safety and to command and control movements of trains authorised to travel on the network’.

The features of the Control-Command and Signalling Subsystems are:

1.

the functions that are essential for the safe control of railway traffic, and that are essential for its operation, including those required for degraded modes(1);

2.

the interfaces;

3.

the level of performance required to meet the essential requirements.

2.2. Scope

The Control-Command and Signalling Subsystems TSI specifies only those requirements which are necessary to assure the interoperability of the trans-European rail system and compliance with the essential requirements.

The Control-Command and Signalling Subsystems include the following parts:

1.

train protection;

2.

radio communication;

3.

train detection.

The Class A train protection system is ERTMS/ETCS whilst the Class A radio system is GSM-R.

For Class A train detection this TSI specifies only the requirements for the interface with other subsystems.

Class B systems are a limited set of train protection legacy control-command and signalling systems that were in use before 20 April 2001. The list of Class B systems is established in the European Railway Agency technical document ‘List of CCS Class B systems’, ERA/TD/2011-11, version 1.0.

The requirements for the Control-Command and Signalling On-board Subsystem are specified in relation to Class A radio mobiles and train protection.

The requirements for the Control-Command and Signalling Track-side Subsystem are specified in relation to:

1.

the Class A radio network;

2.

Class A train protection;

3.

the interface requirements for train detection systems, to ensure their compatibility with rolling stock.

2.3. Application levels (ERTMS/ETCS)

The interfaces specified by this TSI define the means of data transmission to, and (where appropriate) from trains. The ERTMS/ETCS specifications referenced by this TSI provide application levels from which a track-side implementation may choose the means of transmission that meet its requirements.

This TSI defines the requirements for all application levels.

A train equipped with Class A on-board train protection for a given application level must be able to operate on that level and any lower one. As a consequence:

• a train equipped with Class A on-board train protection for level 2 must be able to operate on that level and on level 1 lines,

• a train equipped with Class A on-board train protection for level 1 need not be equipped with a GSM-R data radio but must already implement all level 2 functions so as to ensure that the mere connection of a GSM-R data radio at a later stage will ensure it is equipped for level 2.

(1)

Degraded modes are modes of operation designed to deal with faults. They have been taken into account when designing the Control-Command and Signalling Subsystems.