1. ERRAC (European Rail Research Advisory Council): Rail Strategic Research and Innovation Agenda, 2020
2. ERJU (Europe's Rail Joint Undertaking): Report on preparation of the System Pillar, Ref. Ares (2021) 4674849 - 20/07/2021
3. Shift2Rail projects, https://projects.shift2rail.org/s2r_projects.aspx, Accessed April 22, 2022,
4. RCA: Reference CCS Architecture, https://ertms.be/workgroups/ccs_architecture, Accessed April 22, 2022
5. OCORA: Open CCS Onboard Reference Architecture, https://github.com/OCORA-Public/Publication, Accessed April 22, 2022,