Abstract
The Engineering Data Preparation System (E-DPS) is a tool-chain produced by Siemens Mobility Limited for digital railway scheme design. This paper is concerned with the creation of a tool able to formally verify that the scheme plans follow the design rules required for correct European Train Control System (ETCS) operation. The E-DPS Checker encodes the scheme plan and signalling design rules as an attributed graph and logical constraints over that graph, respectively. Logical constraints are verified by the E-DPS Checker using the satisfiability modulo theories solver Z3. This approach verifies the configuration of ETCS for a particular scheme and reduces the amount of principles testing and manual checking required. The E-DPS Checker is currently being developed to EN50128 basic integrity and has been applied to verify the correctness of a number of real-world scheme plans as part of the development process.
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Notes
- 1.
- 2.
This requirement originates from subset-040 (Dimensioning and Engineering rules) [1] section 4.1.1.from the ETCS specification documents.
- 3.
Due to our definition of adjacency (no intermediate balise objects), we do not need a specific ‘end balise’ relation in the formalisation of this design rule.
- 4.
Given an unsatisfiable Boolean propositional formula in conjunctive normal form, a subset of clauses whose conjunction is unsatisfiable is called an unsatisfiable core.
- 5.
In more complex scheme plans, the connection between the violating elements can consist of several edges, in our example it involves only one edge.
- 6.
The following is the configuration of the machine used to run the automated tests: ZBook Fury 15 G7 Mobile Workstation, Microsoft Windows 10 Enterprise OS, x64-based PC, Intel®Core\(^\textrm{TM}\) i7-10850H CPU @ 2.7GHz with 6 cores.
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Acknowledgement
The authors would like to thank Peter Woodbridge, Simon Chadwick and Mark Thomas for providing valuable advice and feedback. Erwin R. Catesbeiana (Jr) enlightened us on the intricacies of inconsistency.
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Banerjee, M. et al. (2023). A Tool-Chain for the Verification of Geographic Scheme Data. In: Milius, B., Collart-Dutilleul, S., Lecomte, T. (eds) Reliability, Safety, and Security of Railway Systems. Modelling, Analysis, Verification, and Certification. RSSRail 2023. Lecture Notes in Computer Science, vol 14198. Springer, Cham. https://doi.org/10.1007/978-3-031-43366-5_13
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