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
Immersive ETCS training: simulation to support train drivers
20 October 2026 | ERTMS
As ETCS rolls out across Europe, thousands of drivers have to move from lineside signals to cab signalling. Railway operators […]
The Temporary Signalling Management Server (GEST) for Morocco
20 October 2026 | Railway
One of the components of the ERTMS Level 2 trackside signalling system, developed by COMPAGNIE DES SIGNAUX – CSEE for […]
ERTMS test bench for ECM-Progress Rail
20 October 2026 | ERTMS
ECM, a company acquired by Progress Rail in 2018, specialises in the development of RBCs (Radio Block Centres), trackside equipment […]
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. […]
Safety software and systems
All our security systems and software available below. If you have a specific problem, contact us.
operational systems
