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Mobility and Transport

Preparing future evolution

2022 CCS TSI revision

The future evolution of the CCS framework led by the Commission aims to take advantage of the digitalisation and single market that will allow, together with the flexibility of the system, to provide economically efficient solutions both to high-performance networks but also to networks with lower requirements.

DG MOVE, ERA, S2R and the wider sector have agreed on this CCS system framework through the ERTMS Platform. This framework sets out the vision, principles and actions needed to:

  • Ensure that the CCS system is optimally set up to take advantage of digitalisation;
  • Develop a more standardised CCS approach across Europe, reducing costs and complexity;
  • Ensure a non-disruptive evolution, thus maintaining confidence in the viability of current investments and deployments.

The following elements create the vision of an integrated CCS system framework:

One European CCS system

Broader interoperability concept that goes beyond the current specifications in the CCS TSI, with much greater standardisation and much less national variation than at present.

A flexible and adaptable CCS system

The aim is for the CCS software and hardware installed onboard or trackside to be operated and maintained following principles and standards as used in the IT domain. The ultimate objective would be to reach a "plug and play" solution when this is technically and economically feasible.

Harmonisation of operations

Radio based ERTMS will significantly reduce the complexity and network specificities of ETCS Level 1 and Class B lineside signalling, allowing for a broader operational harmonisation.

Optimised traffic management

An optimised traffic management system improves management operations with automated processes for data integration and exchange with other rail business services.

The following principles should guide the development of the above vision:

Principle 1: Fast deployment and development

European-wide deployment of ERTMS and CCS investments need to proceed as quickly as possible, with decommissioning of Class B systems, at least as regards the Core Network, possibly shortly after 2030 with predictable and reasonable deadlines.

Principle 2: A modular and secure system

The CCS system should increasingly be defined in a modular way with common standardised interface specifications between the main CCS components. Separation of the safety-related and non-safety-related layers is needed; this consequently should enable modular safety cases.

Principle 3: Optimal preservation of investment

Implementation of new functionalities and changes to the CCS system must be enabled, but current investments should not be undermined.

Principle 4: Enhanced interoperability

Future CCS evolution will deliver significant business case improvements for the railway sector. This evolution must continue to ensure and enhance the technical and operational interoperability of the Single European Rail Area.


The main target for this CCS system framework is the 2022 CCS TSI revision, which will include:

  • The ERTMS game-changers, which are the heart of future digitalisation building on ERTMS and aim to achieve higher capacity and better performance. According to the definition given in 2016, these game-changers include:
    • Automatic Train Operation (ATO grade of Automation [GoA] 1/2), reducing energy consumption and increasing capacity;
    • Future Radio Mobile Communication System (FRMCS), replacing GSM-R and introducing 5G technologies;
    • Braking curve model optimisation, for improvements through the balance between safety and capacity requirements;
    • ETCS Level 3, increasing capacity and reducing trackside life cycle costs;
    • Satellite positioning, coupled with innovative sensors, enhancing train localisation and odometry;
    • Onboard train integrity, complementing Level 3 and providing a significant opportunity for cost reduction in trackside equipment;
    • Cybersecurity, linked to the vital role of radio communication and the digitalisation of railways.
  • The facilitation of the introduction of digital technologies in rail through modularisation. It includes work primarily on changes linked to CCS onboard modular architecture to deliver a more flexible and robust system. Error correction and compatibility will be managed within the specifications and the product roadmaps.
  • Enhancements to ERTMS technical and operational interoperability, including through greater harmonisation of operational rules linked to ERTMS implementation.