CLEARSY
The CLEARSY company
CLEARSY was founded on January 1, 2001 by the team of engineers responsible for the industrialisation of the formal modelling tool called Atelier B, used in the railway sector to produce safety software.
CLEARSY: safety systems engineering
We are a French SME, specialised in the realisation of safety systems and software from level SIL1 to SIL4. We develop complex systems by ensuring their design, their validation, verification and safety study, right up to their commissioning.
CLEARSY produces safe systems and software in the railway, automotive, military, space and nuclear fields.
Download CLEARSY's leaflet
Download
Download the product catalog
Download
Download the railway products & services presentation
Download
News
SIL2 safety development of the temporary signalling server (GEST) for ARGOS RBC, obtaining SIL2 certification
21 January 2026 | ERTMS
CLEARSY carried out the safety development with a SIL2 requirement level for the temporary signalling server for Compagnie des signaux […]
CLEARSY is once again equipping line 13 of the French Parisian metro with its platform door control system
15 January 2026 | Metro (CBTC)
As part of the project to automate line 13 of the Paris Metro, RATP has once again commissioned CLEARSY to […]
Safety location system: CLEARSY technology at the service of ECOTRAIN
13 January 2026 | ERTMS
Several light rail projects, such as ECOTRAIN unveiled at the end of 2025, are emerging. In this context, CLEARSY innovates […]
CLEARSY supports Luxtram in the development of SIL4 safety-critical automation software
10 December 2025 | Computer science
For several years, CLEARSY has been supporting the development of SIL4 safety-critical automation software for the manoeuvring areas of the […]
CLEARSY is developing a real-time platform for processing high-speed analog data
9 December 2025 | Tools
CLEARSY is developing a real-time hardware-based platform for digitising, dating and filtering high-speed analog data. This platform performs the following […]
Onboard/trackside parameterization of Paris metro line 6 validated by CLEARSY
3 December 2025 | Company
CLEARSY is assisting RATP (French Parisian metro) with the independent second review of the validation of useful parameterization data for […]
Safety software and systems
All our security systems and software available below. If you have a specific problem, contact us.
operational systems
