Regulatory and normative context

Critical and safe operating systems (air and railway transport, nuclear power plants, etc.) are characterized by the fact that failures can have serious consequences both on the lives of people and from an economic and/or environmental viewpoint. In several sectors, including the railway sector, there are normative references that require the demonstration of the achievement of a safe system. 

These references recommend a separation of roles and responsibilities. One team will be responsible for the implementation of the system (development, verification, and validation), while another will be responsible for demonstrating the safety of the system (safety studies, safety case, and analysis of work completeness). 

In the railway sector, the normative reference is composed of standards  

These standards are complemented by a standard related to the transmission aspects. CENELEC EN 50159 is divided into two parts, one part [CEN 01b] is dedicated to closed networks and the other [CEN 01c] to open networks and processing of confidentiality safety. 

According to the CENELEC EN 50129 standard, the requirements are divided into two categories those related to system safety and those not related to safety. 

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