Model Checking Interlocking Control Tables

  • Alessio Ferrari
  • Gianluca Magnani
  • Daniele Grasso
  • Alessandro Fantechi
Conference paper


A challenging problem for model checking is represented by railway interlocking systems. It is a well known fact that interlocking systems, due to their inherent complexity related to the high number of variables involved, are not amenable to automatic verification, typically incurring in state space explosion problems. The literature is however quite scarce on data concerning the size of interlocking systems that have been successfully proved with model checking techniques. In this paper we attempt a systematic study of the applicability bounds for general purpose model checkers on this class of systems, by studying the typical characteristics of control tables and their size parameters. The results confirm that, although small scale interlocking systems can be addressed by model checking, interlockings that control medium or large railway yards can not, asking for specialized verification techniques.


Railway Interlocking Model Checking Interlocking Control Tables Verification 


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  1. 1.
    Anunchai, S.V.: Verification of Railway Interlocking Tables using Coloured Pertri Nets. Proceedings of the 10th Workshop and Tutorial on Practical Use of Coloured Petri Nets and the CPN Tools (2009)Google Scholar
  2. 2.
    Boralv, A.: Formal Verification of a Computerized Railway Interlocking. Formal Aspects of Computing 10 (1998) 338–360CrossRefGoogle Scholar
  3. 3.
    Cimatti, A., et al.: NuSMV 2: An OpenSource Tool for Symbolic Model Checking. CAV 2002, LNCS 2404, 359–364Google Scholar
  4. 4.
    Fokkink , W., Hollingshead, P.: Verification of Interlockings: from Control Tables to Ladder Logic Diagrams. 3rd FMICS Workshop (1998) 171–185.Google Scholar
  5. 5.
    Hansen, K.M.: Formalizing Railway Interlocking Systems. Proceedings of the 2nd FMERail Workshop (1998)Google Scholar
  6. 6.
    Haxthausen, A.E., Peleska, J.: Formal Development and Verification of a Distributed Railway Control System. Proceedings of FM’99, LNCS 1709 (1999) 1546 – 1563Google Scholar
  7. 7.
    Haxthausen, A.E.: Developing a Domain Model for Relay Circuits. International Journal of Software and Informatics (2009) 241–272Google Scholar
  8. 8.
    Holzmann, G.J.: The SPIN Model Checker : Primer and Reference Manual. Addison-Wesley Professional (2003)Google Scholar
  9. 9.
    Kanso, K., et al.: Automated Verification of Signalling Principles in Railway Interlocking Systems. ENTCS 250 (2009) 19–31Google Scholar
  10. 10.
    Mirabadi, A., Yazdi, M.B.: Automatic Generation and Verification of Railway Interlocking Control tables using FSM and NuSMV. Transport Problems : an International Scientific Journal 4 (2009) 103–110Google Scholar
  11. 11.
    Pavlovic, O., Ehrich, H.: Model Checking PLC Software Written in Function Block Diagram. 3rd ICST (2010) 439–448Google Scholar
  12. 12.
    Tombs, D., et al.: Signalling Control Table Generation and Verification. Proceedings of the Conference on Railway Engineering (2002)Google Scholar
  13. 13.
    Winter, K., Robinson, N.J.: Modeling Large Railway Interlockings and Model Checking Small Ones. Proceedings of the 26th Australasian Computer Science Conference 35 (2003) 309–316Google Scholar
  14. 14.
    Winter, K., et al.: Tool Support for Checking Railway Interlocking Designs. Proceedings of the 10th Australian Workshop on Safety Critical Systems and Software (2006) 101–107Google Scholar
  15. 15.
    Schlich, B., Brauer, J., Wernerus, J., Kowalewski, S.: Direct Model Checking of PLC Programs in IL. Proceedings of DCDS (2009) to appearGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • Alessio Ferrari
    • 1
    • 2
  • Gianluca Magnani
    • 1
  • Daniele Grasso
    • 1
  • Alessandro Fantechi
    • 1
  1. 1.University of Florence (DSI)FlorenceItaly
  2. 2.General Electric Transportation Systems (GETS)FlorenceItaly

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