Annex I · Commission Implementing Regulation (EU) 2023/1695

Contents

Appendix BB1.Changes of requirements and transition regimes for On-Board SubsystemsThe notified body shall apply point 7.2.4.1 when issuing the EC type or design examination certificate.Table B1.1Transition regime^note for CCS On-Board Subsystem^note^note^note^noteNoTSI point(s)TSI point(s) in previous version established by Regulation (EU) 2016/919Explanation on CCS TSI change introduced by this RegulationTransition regimeDesign phase started after 28 September 2023Design phase started before 28 September 2023Production phaseVehicle in operationCCS On-Board Error corrections1Appendix A + point 7.2.10.3No mandatory implementation of error corrections published in technical opinionsCCS Subsystems with mandatory implementation of registered error corrections for functionality ETCS up to system version 2.1 and GSM-R.For legal releases (with maintenance of specifications) published before 1 June 2026:If one or more registered errors in RINF are identified for the area of use for which a new authorisation is required:the CCS subsystem integrated into a vehicle type shall implement the necessary error corrections at the latest 6 months after the update of the concerned interoperability constituents.Note:If one or more registered errors in RINF are identified for the area of use for which no new authorisation is required, the CCS subsystem integrated into a vehicle type is considered compliant with the update of the concerned interoperability constituents (as defined in Table B3).For legal releases (with maintenance of specifications) published before 1 June 2026:If one or more registered errors in RINF are identified for the area of use:the CCS subsystem integrated into a vehicle shall implement the necessary error corrections the latest

(a)At the next reauthorisation resulting from another change to the vehicle train protection (ETCS) system;

(a)for legal releases (with error correction specifications) published before 1 January 2026: ERTMS on-board Interoperability Constituents integrated into a vehicle shall implement the necessary error corrections within the area of use specified in the authorisation, the latest 18 months after the registration in RINF of the applicable CR;

(b)At the next upgrade to a higher system version of the ETCS train protection part.

(b)for legal releases (with error correction specifications) published after 1 January 2026 onwards: ERTMS on-board Interoperability Constituents integrated into a vehicle shall comply with the maintained set of specifications of this TSI 18 months after the registration in RINF of the applicable CR.

—1 year after the update of the concerned interoperability constituents (as defined in Table B3) in the case no new authorisation is required;

—if design phase starts on or after 28 September 2026;

—if design phase ends on or after 1 January 2030.

—if design phase starts on or after 28 September 2026;

—if design phase ends on or after 1 January 2030.

—1 January 2030;

—if design phase starts on or after 28 September 2025;

—if design phase ends on or after 28 September 2030.

—if design phase starts on or after 28 September 2025;

—if design phase ends on or after 28 September 2030.

—1 year after the update of the vehicle type in the case a new authorisation is required.

—5 years after the CCS TSI amendment containing the FRMCS specifications;

—if design phase ends on or after 28 September 2030

—2 years and 6 months after the publication by the Agency of the Baseline Compatibility Analysis (BCA) including the answers to the questionnaires in case no new authorisation is required:

—installing marker boards for the first time on a line on which ERTMS is being deployed (and is not in an advanced stage of development), even if a Class B system is also being installed at the same time;

—installing marker boards during a renewal or upgrade (which is not in an advanced stage of development) of the infrastructure subsystem on a line on which ERTMS has been deployed.

—1 year after the update of the concerned interoperability constituents (as defined in Table B3) in the case no new authorisation is required;

—1 year after the update of the vehicle type in the case a new authorisation is required.

—if design phase starts on or after 1 January 2026;

—if design phase ends on or after 1 January 2030.

—1 January 2030;

—5 years after entry into force of the CCS TSI amendment containing the harmonised FRMCS specifications;

—5 years after the date of the notification provided by the IM.

—5 years after the notification date from the IM.

—5 years after the day of the notification provided by the IM.

—5 years after the notification date from the IM.

—5 years after the day of the notification provided by the the IM.

—5 years after the day of the notification provided by the IM.

—3 years after the publication by the Agency of the Baseline Compatibility Analysis (BCA) including the answers to the questionnaires in case a new authorisation is required:

orFor legal releases (with maintenance of specifications) published after 1 June 2026:If one or more registered errors in RINF are identified for the area of use for which a new authorisation is required:the CCS subsystem integrated into a vehicle type shall implement the full maintenance package of error corrections at the latest 6 months after the update of the concerned interoperability constituents.Note:If one or more registered errors in RINF are identified for the area of use for which no new authorisation is required, the CCS subsystem integrated into a vehicle type is considered compliant with the update of the concerned interoperability constituents (as defined in Table B3).For legal releases (with maintenance of specifications) published after 1 June 2026:If one or more registered errors in RINF are identified for the area of use:the CCS subsystem integrated into a vehicle shall implement the full maintenance package of error corrections the latestorETCS On-Board implementation2Points 7.4.2.1, and 7.4.37.4.2.1.2. and 7.4.3(2) grants exemptions for new vehicles to be equipped with ETCS7.4.2.1.2. and point 7.4.3(2) deleted.All newly built vehicles shall be equipped with ETCS.Directly applicableNote:Design phase started after 28 September 2023 here relates to ‘RST design phase’ for any vehicles without ETCS.For special vehicles applicable from 1 January 2026 unless Member States have issued decisions in accordance with 7.4.3.2.Applicable if design phase ends on or after 1 January 2028Note:Design phase started before 28 September 2023 here relates to ‘RST design phase’ for any vehicles without ETCS.For special vehicles applicable if design phase ends on or after 1 January 2030 unless Member States have issued decisions in accordance with 7.4.3.2.Applicable for newly built vehicles placed on the market on or after 1 January 2030For special vehicles applicable for newly built vehicles placed on the market on or after 1 January 2030 unless Member States have issued decisions in accordance with 7.4.3.2.Not applicable3Points 7.4.2.2 and 7.4.3.7.4.2.2 only applicable to upgrade of existing high-speed vehicles7.4.2.2 applicable to vehicle type and/or vehicles requiring a new authorisationDirectly applicableFor special vehicles applicable unless Member States have issued decisions in accordance with 7.4.3.2:orApplicable if design phase ends on or after 1 January 2028Note:Remains directly applicable to high-speed vehicles according to previous CCS TSI.For special vehicles applicable if design phase ends on or after 1 January 2030 unless Member States have issued decisions in accordance with 7.4.3.2.Not applicableNote:Remains directly applicable to high-speed vehicles according to previous CCS TSI.Not applicable4Point 7.4.2.3 (3)7.4.2.4 extension area of use: exemptions to install ETCS in point (3)7.4.2.3 extension area of use: exemptions deleted in point (3)Note:the implementation requirements of CCS TSI established by Regulation (EU) 2016/919 in 7.4.2.4 point (3) remain directly applicable.Not applicableNot applicableNot applicableApplicable from 1 January 2030, if the installation of ETCS is indicated in RINF for the subsequent five years in the new area of use or if the area of use is at least three Member StatesETCS system versions5Intentionally deleted6Appendix A – 7.4.2.4.1 and 7.4.2.4.2 for envelope of legally operated ETCS system versions from 1.0 up to 2.2.Not applicableOn-board implementation of notified ETCS functions from system version 2.2.Design phase started on or after notification from IM and notification is done on or after 1 January 2025:the ETCS system version 2.2 is directly applicable.The ETCS system version 2.2 is applicable if the design phase is not ended within the latest date between following dates:Not applicableNot applicableDesign phase started before notification from IM or notification is done before 1 January 2025:the ETCS system version 2.2 is applicable if the design phase is not ended within the latest date between following dates:7Appendix A – 7.4.2.4.1, 7.4.2.4.2 and 7.4.1.3 for envelope of legally operated ETCS system versions from 1.0 up to 3.0Not applicableOn-board implementation of notified ETCS functions from system version 3.0^note.Not applicable.Note:Transition regime after entry into force of CCS TSI amendment^note:Design phase started after notification from IM and notification is done 2 years after entry into force of the CCS TSI amendment:the ETCS system version 3.0 is directly applicable.Not applicable.Note:Transition regime after entry into force of CCS TSI amendment^note:The ETCS system version 3.0 is applicable if the design phase has not ended within the latest date between following dates:Not applicable.Note:Transition regime after entry into force of CCS TSI amendment^note:the notified ETCS system version 3.0 is mandatory when required for compatibility with the ETCS trackside implementation of ETCS TS 3.0.Not applicable.Note:Transition regime after entry into force of CCS TSI amendment^note:the notified ETCS system version 3.0 is mandatory when required for compatibility with the ETCS trackside implementation of ETCS TS 3.0.Design phase started before notification from IM or notification is done before entry into force of CCS TSI amendment:see transition regime in column ‘Design phase started before 28 September 2023’.8Intentionally deletedFormer sets of specifications #2 and #39Appendix A – Table A 1and Table A 27.4.2.4.1 and 7.4.2.4.27.4.2.3 (7)Annex A – Table A 1 – Table A 2 2 – Set of specification #2The minimum reduced on-board envelope is the envelope up to ETCS system version 2.0.The specifications in Appendix A – Table A 1 and Table A 2 does not include ETCS system version 2.0, since the minimum reduced on-board envelope is the envelope up to ETCS system version 2.1.ApplicableorIn any case the error correction provisions in point 7.2.10 shall be respected with its corresponding transition period.No constraint shall be exported to the other subsystem.Applicable if design phase ends on or after 1 January 2030In any case the error correction provisions in point 7.2.10 shall be respected with its corresponding transition period.No constraint shall be exported to the other subsystem.Applicable on newly built vehicles placed on the market from 1 January 2030In any case the error correction provisions in point 7.2.10 shall be respected with its corresponding transition period.No constraint shall be exported to the other subsystem.Not applicableIn any case the error correction provisions in point 7.2.10 shall be respected with its corresponding transition period.No constraint shall be exported to the other subsystem.10Appendix A – Table A 1and Table A 2Annex A – Table A 1 and Table A 2 3 – Set of specification #3The specifications in Appendix A - Table A 1and Table A 2 have the agreed error corrected version of former set #3ApplicableorIn any case the error correction provisions in point 7.2.10 shall be respected with its corresponding transition period.No constraint shall be exported to the other subsystem.Applicable if design phase ends on or after 1 January 2030In any case the error correction provisions in point 7.2.10 shall be respected with its corresponding transition period.No constraint shall be exported to the other subsystem.Applicable on newly built vehicles placed on the market from 1 January 2032In any case the error correction provisions in point 7.2.10 shall be respected with its corresponding transition period.No constraint shall be exported to the other subsystem.Not applicableIn any case the error correction provisions in point 7.2.10 shall be respected with its corresponding transition period.No constraint shall be exported to the other subsystem.CMD114.2.2 (b) – Cold Movement DetectionCMD OptionalCMD MandatoryDirectly applicable when ETCS is installed for the first time into a vehicle design.Applicable if design phase ends after 1 January 2028 when ETCS is installed for the first time into a vehicle design.Applicable on newly built vehicles placed on the market from 1 January 2030.Not applicableATO On-Board Implementation124.2.18 + Point 7.2.9.2Not applicableATO on-board specification and implementation requirementsDesign phase started on or after notification from IM and notification is done on or after 1 January 2025:ATO on-board requirements are directly applicable.Design phase started before notification from IM or notification is done before 1 January 2025:ATO On-board requirements are applicable if the design phase is not ended within the latest date between following dates:ATO on-board requirements are applicable if the design phase is not ended within the latest date between following dates:Not applicableNot applicableCCS On-Board Modularity134.2.6.5.1 CCS Consist network communication layersIndex 90+ point 5.2.2.2Not applicableMandatory implementation of Ethernet based platformNew requirement in case of grouping of Interoperability Constituents defined in Table 5.1Applicable on newly developed vehicle designs requiring first authorisationorApplicable on newly developed vehicle designs requiring first authorisation if design phase ends on or after 28 September 2030Not applicableNot applicable144.2.2.2(7)-4.2.18 (3)Forwarding information/orders and receiving state information from rolling stock:4.2.6.5.1 CCS Consist network communication layersAppendix A – CCS and RST interfacesIndexes 81, 82, 88, 90Not applicableMandatory implementation of on-board interfaces between CCS subsystem and RST subsystemApplicable on newly developed vehicle designs requiring first authorisationorApplicable on newly developed vehicle designs requiring first authorisation if design phase ends on or after 28 September 2030Not applicableNot applicableFRMCS On-Board implementation:15Point 7.3.2.2Not applicableFRMCS on-board implementation (³)Not applicable.Note:Transition regime after TSI amendment:Design phase started after notification from IM and notification is done after 2 years of the entry into force of CCS TSI amendment: FRMCS on-board implementation is directly applicable.Not applicable.Note:Transition regime after TSI amendment:FRMCS on-board is applicable if the design phase is not ended within the latest date between following dates:Not applicable.Note:The FRMCS on-board implementation is mandatory when required for compatibility with FRMCS only trackside implementationNot applicable.Note:The FRMCS on-board implementation is mandatory when required for compatibility with FRMCS only trackside implementationDesign phase started before notification from IM:see transition regime in column ‘Design phase started before before 28 September 2023’.Partial fulfilment:16Point 6.1.1.2Points 6.1.1.3 and 6.4.3 are deleted.With respect to 6.1.1.2 it is no longer possible to exclude mandatory functionalities, interfaces or performance except if listed in Appendix G.ApplicableIn cases of partial fulfilment, a condition for use shall be included when authorising vehicles to be placed on the market, enforcing compliance at the next upgrade of the vehicle train protection part.Functions included in system versions 2.2 and 3.0 which are not implemented due to partial fulfilment and which are not essential for the intended area of use, shall be implemented at the earliest occurrence of one of the following:Not applicableNot applicableDMI indication translation17Appendix ENo mandatory harmonised translation of DMI indicationsHarmonised translation of DMI indications.Directly applicableApplicable if design phase ends on or after 28 September 2030.Not applicableNot applicableESC/RSC Statements184.2.17 ETCS and radio system compatibility6.2.4.3 ETCS and radio system compatibility checks for interoperability constituent6.3.3.1 ETCS and radio system compatibility checksFirst version of the requirements for ESC/RSC Statements.Updated requirements for assessment of ESC/RSC Statements, including the ESC/RSC IC Statement.Applicable if design phase ends after 28 March 2024.Applicable if design phase ends after 28 March 2024.Not applicableNot applicableSystem identifier194.2.20.3 System identifierTable 6.2.1, row 2dNot applicableNoBo check for system identifier.Applicable if design phase ends after 28 March 2024.Applicable if design phase ends after 28 March 2024.Not applicableNot applicableSubsystem certificate and integration between parts204.2.6 On-board interfaces internal to CCS.Table 6.2.1, row 36.4 Provisions in cases of partial assessment of TSI requirementsNot explicitly addressed in the table.Integration between parts of the subsystem.Structure of the subsystem certificatesNote:Not a new requirement but clarification.Directly applicableDirectly applicableNot applicableNot applicableAppendix D template216.5.1 Content of EC certificates6.5.2 Content of EC declarationsNot applicableMandatory use of the Appendix D template in EC certificates and EC declarations.Applicable if design phase ends after 28 March 2024.Applicable if design phase ends after 28 March 2024.Not applicableNot applicableSpecific cases22Point 7.7.27.7.2.9 Italy 7.7.2.12 Ireland 7.7.2.14 Austria7.6.2 Previous version of specific cases.Update of specific cases by introducing new requirements for the CCS on-board subsystem for certain Member States.Directly applicableDirectly applicableApplicable for newly built vehicles placed on the market as of 1 January 2030Not applicableStandards23Appendix A Table A3Annex A Table A3New standard EN50716 has superseded EN50128Directly applicableApplicable if design phase ends after 30^th October 2026Not applicableNot applicableTable B1.1bTransition regime for CCS On-Board SubsystemNo | TSI point(s) | TSI point(s) in the version before the change introduced by Implementing Regulation (EU) 2026/693 | Explanation on CCS TSI change introduced by Implementing Regulation (EU) 2026/693 | Transition regimeDesign phase started after 5 May 2026 | Design phase started before 5 May 2026 | Production phase | Vehicle in operationTest specifications1 | Appendix A, Table A 2, Index 98 | Index 98 was reserved. | The final version of the document is included. | Applicable if design phase ends after 1 January 2026 if ATO part (ATO Baseline 1 Release 1) is implemented. | Applicable if design phase ends after 1 January 2026 if ATO part (ATO Baseline 1 Release 1) is implemented. | Not applicable | Not applicableReduced envelopes2 | Appendix A, Table A 2, Indexes 104, 84, 85 | Index 104 was reserved.ATO on-board implementation based on index 84, 85 v1.0.0. | The final version of the document is included, and second row from Appendix G is removed.Table A1 references to index 104 are completed were necessary.ATO on-board implementation based on index 84, 85 v1.1.0. | Applicable if design phase ends after 1 January 2026 if ETCS Baseline 4 Release 1 or ATO Baseline 1 Release 1 is implemented. | Applicable if design phase ends after 1 January 2026 if ETCS Baseline 4 Release 1 or ATO Baseline 1 Release 1 is implemented. | Not applicable | Not applicableDMI Indication translations3 | Appendix E | Appendix E | Addition of missing terms | Same as Table B1.1, row 17Transition regime clarification4 | Appendix B. Table B1.1 | Appendix B, Table B1.1 clarifications | Clarifications and corrections regarding transition regime. | Directly applicableTable B1.2Transition regime for RST SubsystemNo | TSI point(s) | TSI point(s) in the version established by Regulation (EU) 2016/919 | Explanation on CCS TSI change introduced by this Regulation | Transition regimeDesign phase started after 28 September 2025 | Design phase started before 28 September 2025 | Production phase | Vehicle in operation1 | Index 77 | V4 – Frequency management not fully defined for the vehicle | V5 – Frequency management fully defined for the vehicle | Directly applicable with the exception of point 3.2.2. This point is applicable to newly developed vehicle designs requiring first authorisation as defined in Article 14(1)(a) of Commission Implementing Regulation (EU) 2018/545 if design phase starts on or after 28 September 2025 or if design phase ends on or after 28 September 2030;Applicable to modified vehicle designs requiring new authorisation as defined in Article 14(1)(d) of Commission Implementing Regulation (EU) 2018/545 if design phase ends on or after 28 September 2030. | Applicable if design phase ends on or after 28 September 2030. | Not applicable | Not applicable2 | Point 7.7.27.7.2.5 Lithuania, Latvia and Estonia7.7.2.7 Luxembourg7.7.2.9 Italy7.7.2.12 Ireland7.7.2.13 Bulgaria | 7.6.2 Previous version of specific cases. | Update of specific cases by introducing new requirements for the RST subsystem for certain Member States. | Directly applicable. | Applicable if design phase ends on or after 28 September 2030. | Not applicable | Not applicableTable B1.2bTransition regime for RST SubsystemNo | TSI point(s) | TSI point(s) in previous version established by Regulation (EU) 2023/1695 | Explanation on CCS TSI change in Regulation (EU) 2026/693 | Transition regimeDesign phase started after 5 May 2026 | Design phase started before 5 May 2026 | Production phase | Vehicle in operation1 | Appendix B, Table B1.2 | Appendix B, Table B1.2 clarifications | Clarifications and corrections regarding transition regime. | Directly applicableB2.Changes of requirements and transition regimes for CCS Trackside SubsystemThe notified body shall apply point 7.2.4.2 and 7.4.1.2 when issuing the EC type or design examination certificate.Table B2Transition regime for CCS Trackside SubsystemNoTSI point(s)TSI point(s) in the version established by Regulation (EU) 2016/919Explanation on CCS TSI change introduced by this RegulationTransition regimeCCS Trackside Error Corrections1Appendix A+ Points 7.4.1.2 and 7.2.10.3Set 1, 2 and 3 of specifications without error correctionsTable A2 includes the maintenance of the functions into 1 set of specifications.CCS Trackside Subsystems, which are in advanced stage of development or in operation, shall implement the identified set of corrections for the unacceptable errors as described in point 7.2.10.1 within:CCS Trackside Subsystems placed into service after 28 September 2023, which are not in advanced stage of development, shall directly comply with the maintained set of specifications of this TSI.CCS Trackside Enhancements2ETCS: Appendix A; + point 7.4.1.3Not applicableNew ETCS functions from system version 2.2 to 3.0If implemented (optional trackside function), directly applicable for ETCS equipped lines3ETCS: Point 4.2.1Table 6.3 row 3 Appendix A; Table A.2 – Index 38, 101Marker-board definition based on 06E068EN 16494 and engineering rules for harmonised marker boardsDirectly applicable if:orDetailed provisions concerning the requirements for fitting harmonised marker boards are set out in Appendix A, Table A.2, Index 101.44.2.19No specificationsATO Trackside ImplementationIf implemented (optional trackside function), directly applicable for ATO GoA1/2 implementation on ETCS equipped lines5FRMCS radio systemNo specificationsNew set of FRMCS specificationsIf implemented (optional trackside function), directly applicable for FRMCS projects when FRMCS specifications are completed and published with an amendment of this CCS TSI.Partial fulfilment:6Not applicablePoints 6.1.1.3 and 6.4.3 are deleted.When implemented, all functions, performance and interfaces or performance shall comply with the Chapter 4 (including the specifications referred to in Appendix A).After the 28 September 2030.Former set of specifications set #1, #2 and #37Appendix A - Table A 2Annex A - Table A 2 1 – Set of specification #1, Table A 2 2 – Set of specification #2 Table A 2 3 – Set of specification #3Table A 2 includes the maintenance of the functions into 1 set of specifications.Requirements and deadlines defined in point 7.4.1.2. ‘Set of specifications from previous versions of the CCS TSI.’ of ANNEX I of this TSI.Standards8Appendix A 3Annex A - Table A 3New standard EN50716 has superseded EN50128After the 30 October 2026.ESC/RSC definitions94.2.17 ETCS and radio system compatibilityTable 6.3, Row 10Agency analysis of IM submissions.NoBo assessment of new or updated ESC/RSC definitionApplicable since 28 September 2024.System identifier104.2.20.3 System identifierTable 6.3, row 2eNot applicableCheck for system identifierApplicable since 28 March 2024.Appendix D template16.5.1 Content of EC certificates6.5.2 Content of EC declarationsNot applicableMandatory use of Appendix D template.Applicable since 28 March 2024.Table B2bTransition regime for CCS Trackside SubsystemNoTSI point(s)TSI point(s) in the version before the change introduced by Implementing Regulation (EU) 2026/693Explanation on CCS TSI change introduced by Implementing Regulation (EU) 2026/693Transition regime for TSI changes introduced by Implementing Regulation 2026/693Test specifications1Appendix A, Table A 2, Index 98Index 98 was reserved.The final version of the document is included.Applicable as of 1 January 2026 if ATO part (ATO Baseline 1 Release 1) is implemented.ATO24.2.19ATO Trackside implementation based on indexes 84, 85 v1.0.0ATO Trackside implementation based on indexes 84, 85 v1.1.0Applicable as of 1 January 2026 if ATO part (ATO Baseline 1 Release 1) is implemented.Harmonised Marker Boards3ETCS: Appendix A, Table A.2, Indexes 38, 101EN 16494 2015 and engineering rules for harmonised marker boards v1-EN 16494 2025 and engineering rules for harmonised marker boards v2-Directly applicable if:orDetailed provisions concerning the requirements for fitting harmonised marker boards are set out in Appendix A, Table A.2, Index 101.Transition regime clarification4Appendix B, Table B2Appendix B, Table B2 clarificationsClarifications and corrections regarding the transition regime.Directly applicableB3.Changes of Interoperability Constituent requirements and transition regimes for CCS SubsystemThe notified body shall apply point 7.2.4.3 when issuing the EC type or design examination certificate.7.2.4.3.Transition periods defined for CCS Subsystems are applicable for the Interoperability Constituents unless specified otherwise in these tables.Table B3Transition regime for CCS Interoperability ConstituentsNoTSI point(s)TSI point(s) in the version established by Regulation (EU) 2016/919Explanation on CCS TSI change introduced by this RegulationTransition regime1Appendix A+ point 4.2.20.1+ point 7.2.10.2Technical opinions on Art. 10 errors are not legally bindingImplementation of error corrections into ERTMS on-board Interoperability Constituents for existing CCS subsystems for functionality ETCS up to system version 2.1 and GSM-R.If one or more registered errors are identified for the area of use specified in the authorisation of the vehicle:This transition regime can be handled flexibly in agreement with the applicant for the EC verification of the on-board subsystem and the railway undertaking as long as the overall transition regime (as per Table B1.1 plus as per Table B3) is met.Note:If no errors are registered for the concerned area of use, error corrections will be mandatory implemented according to the transition regime linked to the point of partial fulfilment.2Appendix A+ point 4.2.20.1+ point 7.2.10.2Technical opinions on Art. 10 errors are not legally bindingImplementation of error corrections into ERTMS Trackside Interoperability Constituents for new CCS trackside projects for functionality, ETCS up to system version 2.1 and GSM-R.ERTMS Trackside Interoperability Constituents, integrated into a CCS Trackside Subsystem for which the project is not in advanced stage of development, shall directly comply with the maintained set of specifications of this TSI.3Appendix A+ point 4.2.20.1+ point 7.2.10.2Technical opinions on Art. 10 errors are not legally bindingImplementation of error corrections into ERTMS Trackside Interoperability Constituents for existing CCS trackside projects (i.e. trackside subsystem in advanced stage of deployment or in operations)ERTMS Trackside Interoperability Constituents, integrated into a CCS Trackside Subsystem for which the project is in advanced stage of development or being integrated in a CCS Trackside Subsystem in operation, shall implement the identified set of corrections for the unacceptable trackside errors within 2 years after the latest date between the entry into force of the TSI and the publication by the Agency of the Baseline Compatibility Analysis (BCA) including the answers to the questionnaires.4Appendix A, Table A.2Index 90, 92+ 5.2.2.2+ 4.2.2.2 (7)+ 4.2.6N/AImplementation of Ethernet based communication for integration with ATO On-Board IC and FRMCS On-Board ICNew ETCS On-Board Interoperability Constituents placed on the market within 2 years after entry into force of the TSI shall implement the Ethernet based connections required for ATO and FRMCS interfacing as specified in Index 90 (points 3.1.1.2 and 3.1.1.3) and as specified in Index 92 (point 7.2)54.2.20.3 System identifierTable 5.1 row 1, 4, 5, 6.Table 5.2 row 1, 2, 3, 4, 5, 6.Not applicableNoBo check for system identifier.Applicable since 28 March 2024.66.5.1 Content of EC certificates6.5.2 Content of EC declarationsNot applicableMandatory use of the Appendix D template.Applicable since 28 March 2024.Table B3bTransition regime for CCS Interoperability ConstituentsNo | TSI point(s) | TSI point(s) in the version before the change introduced by Implementing Regulation (EU) 2023/1695 | Explanation on CCS TSI change introduced by Implementing Regulation (EU) 2023/1695 | Transition regime for TSI changes introduced by Implementing Regulation (EU) 2026/6931 | Appendix B, Table B3 | Appendix B , Table B3 clarifications | Clarifications and corrections regarding the transition regime. | Directly applicable2 | Appendix A, Table A 2, Indexes 31, 37b, 37c and 37d. | Appendix A, Table A 2, Indexes 31, 37b, 37c and 37d. | The updated versions of the document are included. | Applicable as of the latest 1 July 2026 or the availability of the new version Subset 76 as an Agency Thechnical Opinion3 | Appendix A Table index 104 | Appendix A Table index 104 | Updated version of the document is included | Applicable six months after EiF