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.
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News
CLEARSY achieves SIL2 certification for its new DMI
5 October 2026 | Component
As part of its efforts to modernise and digitise on-board systems, TALGO develops TCMS (Train Control and Management System) solutions […]
Testing ETCS before hitting the tracks
5 October 2026 | ERTMS
In 2025, Dutch railway operator Nederlandse Spoorwegen (NS) and Stadler signed a framework agreement for the delivery of 36 FLIRT […]
Line 13 of the Paris Metro is preparing for the arrival of new rolling stock MF19
24 September 2026 | Metro (CBTC)
Developed by CLEARSY for the RATP, the COPP2 system has been equippeing line 13 of the Paris Metro since 2010. […]
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 software and systems
All our security systems and software available below. If you have a specific problem, contact us.
operational systems
