Formal Methods and Formal Data Validation for Railways

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ClearSy Systems Engineering

Formal method is highly advised by the European CENELEC standards for development of safety critical train control. The major industrials use it for their CBTC and NYCT ( New York metro) is asking their supplier for formal method based demonstration that their CBTC prevents trains from colliding.

Formal data validation is a technique used to automate verification of static data. Very often it is used to check safety parameters of train control and track topology settings. Formal data validation is also widely used by the major railway industrials (Siemens Mobility, RATP, Alstom).

Formal methods are now industry ready, able to scale up to real size railway projects and to provide a real support for successfully completing safety demonstrations.

In this white paper, ClearSy show that several formal methods (B, Event-B, formal data validation) directly contribute to safety critical software development, system-level specification analysis and constant parameters validation, with the help of mathematical proof.

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Safety Critical Systems for the Railway Industry

ClearSy is an expert in safety critical systems for the railway industry. From design to commissioning, ClearSy develops and installs certified vital software and systems for trains, metros, commuter trains, light rails and rail infrastructures worldwide. In their effort to provide fully turn-key systems, ClearSy engineers pass SIL certification for their clients before delivery (according to standards EN 50126, EN 50128, EN 50129, 61508). As a leading expert in rail safety, ClearSy proposes products and consulting to ensure safety, availability of rail systems and reduce cost of safety development. ClearSy has been established to promote formal B method for industrial applications since 2001. Today, it is a reference in the field and now proposes development and support in a formal method (based on mathematical proofs). ClearSy’s products and services are designed to address 4 issues of current transportation authority:

Station Safety Systems

ClearSy offers a range of products to increase flow and safety of passenger in urban transportation systems. Its systems are in operation in Paris, Stockholm, Sao Paulo, Los Teques, Lyon and Bordeaux ... These systems are designed to combine safety and availability in order to fully address the needs of the most crowded public transportation network. To ensure station safety, ClearSy offers: [gallery ids="13892,13891,13887"]

Train Operation Safety

To ensure safety during train operation, ClearSy proposes signaling systems and monitoring devices to prevent critical accidents: [gallery ids="13888,13889,13890"]

Cost Reducing Critical Software for Rail

ClearSy has developed cheaper alternative products for vital application. They are also committed to reduce cost of critical software and system development.

Rail Safety Engineering Consultants

ClearSy has acquired a strong expertise in advanced rail safety and now it offers services. Safety engineering: In safety, B formal method is a strong asset. For example, ClearSy proved the CBTC of the NYCT line 7 is totally safe at system level. Also, B method is used to design safety critical software of CBTC driverless by major companies. When it comes to train management system, ClearSy engineers have already assisted clients in their ERTMS and CBTC projects by developing interlocking or writing specifications. ClearSy provides training in B Method and for ERTMS/ETCS." ["post_title"]=> string(27) "ClearSy Systems Engineering" ["post_excerpt"]=> string(0) "" ["post_status"]=> string(7) "publish" ["comment_status"]=> string(6) "closed" ["ping_status"]=> string(6) "closed" ["post_password"]=> string(0) "" ["post_name"]=> string(27) "clearsy-systems-engineering" ["to_ping"]=> string(0) "" ["pinged"]=> string(0) "" ["post_modified"]=> string(19) "2019-10-25 15:22:38" ["post_modified_gmt"]=> string(19) "2019-10-25 14:22:38" ["post_content_filtered"]=> string(0) "" ["post_parent"]=> int(0) ["guid"]=> string(60) "" ["menu_order"]=> int(57) ["post_type"]=> string(9) "suppliers" ["post_mime_type"]=> string(0) "" ["comment_count"]=> string(1) "0" ["filter"]=> string(3) "raw" }