Formal model for generating railway interlocking software based on a modularized track model

This paper discusses the possibility to create railway interlocking software in an automated process. The classic approaches are interlocking tables or relay modules. In the case of using interlocking tables, they form the core of the signal box. This means ideally that two signal boxes differ only by their interlocking tables. The major disadvantage of interlocking tables is the massive manual work to create and verify them. The paper will first define its own railway regulations which are a subset of the German train regulations. It will then formally design a model for a blank signal box. The next step is the customization of the empty signal box. This will be done by a graphical track editor which enables a user to enter a track layout and creates the interlocking table from the topology. Key–Words: Interlocking, Railway, Safety, Verification, Train control