Abstract A basic requirement which needs to be fulfilled by railway traffic control systems is to ensure a high level of safety. That is why, CENELEC (European Committee for Electrotechnical Standardization) norms include RAMS (Reliability, Availability, Maintainability, Safety) requirements for these systems. The process of designing, building and approving for exploitation the railway traffic control systems is finished with the assessment of correctness of each of the stages. Verification and validation of a railway traffic control system is a complicated process which requires a necessary experience by the people participating in this process. That is why it is rational to use a custom software, called the expert system. The authors of this article, on the basis of the Exsys Corvid environment, have built an expert system for the verification and validation of level crossing protection systems. The conducted research has proven both a great usefulness of this technology and, at the same time, the need to broaden the research on other kinds of railway traffic control systems.


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