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
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 […]
Diversification continues
10 June 2026 | Aeronautics
In safety-critical systems, trust is built over the long term. Expertise developed in the railway sector can often meet the […]
Simulation for the ERTMS of the Future
4 June 2026 | ERTMS
As part of the ongoing development of the ERTMS standard, the European Union Agency for Railways (ERA) is studying the […]
Safe validation of railway track topology
4 June 2026 | Railway
To operate driverless metros at full capacity, it all starts… with data. The digital representation of the railway infrastructure creates […]
Tailor-made automatic train stop system
26 May 2026 | Offers
Stadler is supplying RATP with maintenance trains that must be fully compatible with the Paris network’s signaling system. The goal is to ensure the proper functioning of the automatic train stop system when trains pass through restricted signals, in order to enhance the safety of […]
Safety software and systems
All our security systems and software available below. If you have a specific problem, contact us.
operational systems
