# Commission Decision of 30 May 2002 concerning the technical specification for interoperability relating to the control-command and signalling subsystem of the trans-European high-speed rail system referred to in Article 6(1) of Council Directive 96/48/EC (notified under document number C(2002) 1947) (Text with EEA relevance) (2002/731/EC), Division 7.2.2.2: Lines to be upgraded (re-signalled)

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

When control-command and signalling is upgraded, a line shall be equipped with the class A functions and interfaces according to the specifications given in Annex A. The control-command infrastructure shall provide the class A control-command interfaces for the trains in the same way as for lines to be constructed.
The upgrade may concern separately the GSM-R radio part, the ETCS part and the train detection part of the control-command subsystem.
After the upgrade the existing class B equipment may remain in use simultaneously with class A according to point 7.2.1.2.
Class B control-command equipment trackside EMC limits may remain in use until the control-command subsystem is upgraded.
The time interval in which a certain line is equipped with both class A and class B control-command equipment is a trackside transition phase. During this transition 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 on-board the interoperable trains for running on such a line.

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Source: https://www.legislation.gov.uk/eudn/2002/731/annex/division/7/division/7.2/division/7.2.2/division/7.2.2.2 (the official version)
Page: https://openlegislation.uk/eu-decision-2002-731/annex/division-7/division-7.2/division-7.2.2/division-7.2.2.2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.