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
The temporary signalling server (GEST) is ready for deployment
11 September 2026 | ERTMS
One of the components of the ARGOS ERTMS Level 2 trackside signalling system, developed by Compagnie des Signaux – CSEE, […]
Let’s go for the CLEARSY’s lessons 2026-2027 in french universities
9 September 2026 | R&D
To mark the start of the new academic year, CLEARSY is launching its 2026-2027 university course programme. Our teams will […]
CLEARSY at the INNOTRANS BERLIN trade show: HALL 27, BOOTH 301
2 September 2026 | Exhibitions/conferences
The CLEARSY team is delighted to be participating in the INNOTRANS trade show, which will take place September 22–25, 2026, […]
Safety is demonstrated first at the system level
27 August 2026 | Computer science
For railway signalling and urban transport systems, safety cannot be reduced to a simple check carried out at the end […]
A critical system upgraded in Malaysia!
26 August 2026 | Railway
Prasarana Malaysia Berhad, the main operator of Kuala Lumpur’s public transport network, has once again placed its trust in CLEARSY […]
CLEARSY’s RS4 is coming to the United States
26 August 2026 | Component
Hitachi Rail USA is supporting the modernisation of the Washington Metro with the new 8000 series trains, designed to meet […]
Safety software and systems
All our security systems and software available below. If you have a specific problem, contact us.
operational systems
