Practical Formal Methods in Railways - The SafeCap Approach

This paper presents the SafeCap Platform approach to the verification of railway safety properties. We discuss how the hierarchy of formal theories is used to capture the railway domain and interface with verification tools; we explain the contribution of each individual theory to the overall task of safety verification and capacity assessment. Finally, we briefly relate our experience of using two independent verification chains to validate concrete track layouts and control tables against the SafeCap safety theories.