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 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 […]
SIL4 Signalling changeover unit deployment
7 July 2026 | Component
CLEARSY supplies Hitachi Rail with SIL4 safety latching interface system designed to replace railway signalling systems. This equipment ensures a fast, simple and secure switchover between the old and new systems, which is essential for operations. The validation of complex systems generally requires several test campaigns before they are put into service. During this period, the old signalling system continues […]
A long-term partnership for defence innovation
23 June 2026 | Defense
Since 2022, CLEARSY has been working with EXAIL to supply new equipment for a naval mine countermeasure system. Thanks to its expertise in the design and industrialization of tailor-made […]
Safety software and systems
All our security systems and software available below. If you have a specific problem, contact us.
operational systems
