Reference CCS architecture

Reference CCS architecture

When considering the business challenges facing the railways and recognising the opportunities provided by a collaborative approach to Command and Control Systems (CCS), Infrastructure Managers consider that a joint development of a future 'Reference CCS Architecture' (RCA) will have many benefits. A White Paper has therefore been developed to express the thoughts of the members of the ERTMS Users Group and the EULYNX Consortium.

The RCA White Paper and related communication strategy are aimed at:

  • Highlighting the opportunities associated with Infrastructure Managers working together to develop a single modular framework for future CCS where the interfaces that are being developed within EULYNX are a vital cornerstone;
  • Providing a common understanding for Infrastructure Managers, industry partners and other stakeholders on the RCA initiative;
  • Providing the background and justification for the RCA initiative;
  • Providing direction to industry partners and other stakeholders, including recognition of the benefits associated with building upon and aligning existing developments such as ETCS, ETCS Game Changers, EULYNX and Shift2Rail;
  • Providing assurance that the RCA initiative will respect existing CCS investments by recognising the need for a flexible migration approach;
  • The White Paper also highlights how the Infrastructure Managers will organise their collaborative approach, utilizing the existing ERTMS Users Group and EULYNX Consortium to provide the technical direction and development activities. It also identifies the need for engagement with Railway Undertakings and Suppliers.

Based on the white paper, the RCA initiative is driven by several railways organized in EUG and EULYNX. The RCA initiative strives for a substantial improvement in cost, capacity, safety, reliability of the CCS (command, control, signalling) system. RCA starts with radio-based ETCS cab-signalling and EULYNX interfaces and adds a harmonized architecture with clearly defined interfaces leading to an upgradable system with interchangeable components. RCA includes the game-changers such as  ATO, moving block, train-borne localization, FRMCS.

A first draft of RCA has been released in February 2019. This RCA Alpha is not a specification but describes the RCA concepts to allow further discussion and feedback from railways, suppliers, regulators. Based on the feedback the RCA concepts will be incrementally developed into full specifications.

Several workshops have been organised and the resulting feedback (from railways, suppliers, sector organizations) has been used to produce the RCA Beta, which was released in August 2019. RCA Beta mostly deals with corrections, misunderstandings and frequently asked questions.

RCA Beta is released in the form of an updated set of documents from RCA Alpha and with a few additional “Beta chapters” on topics which had generated a lot of interest. New “Beta chapters” include: Platform Independence, Modular Safety, Capacity Effects, Architectural Approach.

If you would like to give feedback or to become involved in the evolution of RCA, please contact us.

The focus of RCA is on the architecture of the CCS trackside. There is a similar initiative, called OCORA, which addresses architecture of the CCS on-board side. Please follow the link on this page for more information on OCORA.