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Various radio communication systems have been used in railway systems such as communication-based train control (CBTC) systems, passenger information service systems, wireless sensor networks, etc. The design and evaluation work involved in constructing the radio communication systems used in railway systems is expensive in terms of time and money in the present circumstances. Thus, for the purpose of facilitating this work, the authors have developed a simulation method to calculate the transmission quality (bit errors, packet loss rates, latency, etc.) taking into consideration the railway-specific environment and usage. This paper outlines the features of a digital radio communication system simulator that calculates transmission quality taking into consideration the railway-specific environment and usage. This paper also shows some examples of simulation results and demonstrates the validity of the simulator.

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When an interlocking device is improved, a large number of signal cables have to be re-laid and wiring connections must be confirmed. There are possibilities of wiring errors in the improvement of the interlocking device. A signal control system using an optical LAN is developed for the purpose of reduction of signal cables and wiring work. This system controls signal devices by transmitting digital information through an optical network, and it has a method of system configuration to make the system more flexible and secure. To introduce this system effectively, an application of assurance technologies is necessary because this system coexists with the existent interlocking device over the period of construction and operation.In this paper, we introduce this system and describe assurance technologies used for this system.