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The interlock equipment has supported the safe train operations of today as a device for controlling the operation in the safe station premises. This paper surveys interlock device’s transition from mechanical signals to today’s electronic signaling devices and analyzes how security mechanisms have evolved. It shows that safety has been supported by the notion of fixed block system, in which only one train is allowed to travel in one route. In addition, this paper discusses the realization of moving block suitable for Communication Based Train Control era and proposes a new interlock table. Unified Train Control System (UTCS) is introduced as an implementation example, and it is shown that the UTCS is an IoT-era train control, which realizes simplification of the interlock function itself and flexible and safe control by exchanging information between the central processing unit and the point machine, the level crossing device and the train.
CBTC, interlocking equipment, moving block, railway signaling, train control
[1] Suzuki, M., History of Japanese Railway Signal, Signal Association of Japan, 1980.
[2] Akita, K., Watanabe, T., Nakamura, H. & Okumura, I., Computerized interlocking system for railway signalling control: SMILE. IEEE Transactions on Industry Applications, IA-21-4, pp. 826–834, 1985.
[3] Kantz, H. & Koza C., The ELEKTRA railway signalling-system: field experience with an actively replicated system with diversity. Proceedings of the 25th International Symposium on Fault-Tolerant Computing, 453–458, 1995.
[4] Rao, V.P. & Venkatachalam, P.A., Microprocessor-based railway interlocking control with low accident probability. IEEE Transactions on Vehicular Technology, VT-353, 141–147, 1987.
[5] Banci, M., Fantechi, A. & Ginesi, S., Some experiences on formal specification of railway interlocking systems using statecharts. Train International Workshop at SEFM2005, 2005.
[6] Banci, M., Fantechi, A. & Ginesi, S., The role of formal methods in developing a distributed railway interlocking system. Proceedings of the 5th Symposium on Formal Methods for Automation and Safety in Railway and Automotive Systems, 220–230, 2004.
[7] She, X., Sha, Y., Chen, Q. & Yang, J., The application of graph theory on railway yard interlocking control system. Proceedings of the IEEE Intelligent Vehicles Symposium, 883–888, 2007.
[8] Dipoppa, G., D’Alessandro, G., Semprini, R. & Tronci, E., Integrating automatic verification of safety requirements in railway interlocking system design. Proceedings of the of 6th IEEE International Symposium on High Assurance Systems Engineering, 209–219, 2001.
[9] Hartonas-Garmhausen, V., Campos, S., Cimatti, A., Clarke, E. & Giunchiglia, F., Verification of a safety-critical railway interlocking system with real-time constraints. Science of Computer Programming, 36, 53–64, 2000.
[10] Petersen, J.L., Automatic verification of railway interlocking systems: a case study. Proceedings of the 2nd Workshop on Formal Methods in Software Practice, 1–6, 1998.
[11] Hei, X., Takahashi, S. & Nakamura, H., Distributed interlocking system and its safety verification. Proceedings of the 6th World Congress on Intelligent Control and Automation, 8612–8615, 2006.
[12] Heijnen, F., EULYNX: A route to standardization. Global Railway Review, Posted: 9 July, 2016.
[13] Saito, Y., Asano, A., Nakamura, H., Mochizuki, H. & Takahashi, S., Restructuring of train control system by hierarchical design. IEEJ Journal C, 136(7), pp. 923–928, 2016.
[14] Saito, Y., Asano, A., Nakamura, H. & Takahashi, S., A proposal for the design of integrated train control systems capable of improving reliability and safety. Proceedings of the Third International Conference on Railway Technology: Research, Development and Maintenance, Civil-Comp Press, Paper 70, pp. 1–11, 2016.
[15] Nakamura, H. & Saito, Y., Study on a new train control system in the IoT era: from the viewpoint of safety 2.0. Applied Modern Control, IntechOpen: London, U.K., pp. 3–14, 2018.
[16] Nakamura, H., How to deal with revolutions in train control systems. Engineering 2, ELSEVIER, pp. 380–386, 2016.