# Commission Decision of 7 November 2006 concerning a technical specification for interoperability relating to the control-command and signalling subsystem of the trans-European high speed rail system and modifying Annex A to Decision 2006/679/EC concerning the technical specification for interoperability relating to the control-command and signalling subsystem of the trans-European conventional rail system (notified under document number C(2006) 5211) (Text with EEA relevance) (2006/860/EC), Division 7.2.3: Additional Class-B equipment on a Class A — equipped line

Extent: E+W+S+N.I.

On a line equipped with ETCS and/or GSM-R, additional Class B equipment is possible in order to allow the operation of rolling stock not compatible with Class A during the migration phase. It is allowed to use existing Class B equipment on-board as a fallback arrangement to Class A system: this does not allow an infrastructure manager to require Class B systems onboard the interoperable trains for running on such a line.
Where dual fitment and operation of Class A and B systems occurs, then both systems may be active simultaneously onboard, provided that national technical requirements and operating rules support this manner and that interoperability is not compromised. The national technical requirements and operating rules will be provided by the Member State.

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Source: https://www.legislation.gov.uk/eudn/2006/860/annex/division/7/division/7.2/division/7.2.3 (the official version)
Page: https://openlegislation.uk/eu-decision-2006-860/annex/division-7/division-7.2/division-7.2.3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.