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There have been a large number of accidents at level crossings of railways and this has been considered to be a significant issue to be solved for the realization of safe and stable railway transport. A conventional level crossing control system is characterized by the use of two types of electronic train detectors; one detects a train approaching to a level crossing section and the other then detects the train having left the level crossing. By contrast, closed-loop level crossing control systems in which level crossing control equipment and train-borne equipment communicate with each other have been advocated and are expected to serve as an effective solution to the abovementioned issue. This paper describes the following three types of closed-loop level crossing control systems: decentralized level crossing control system, fully-centralized comprehensive level crossing control system and fully-centralized individual level crossing control system. This paper then assesses the safety of these systems in comparison to the conventional level crossing control system. For the purpose of the assessment of their safety, a new accident analysis model called STAMP (systems theoretic accident model and processes) that is suitable for software intensive systems is used to clarify the advantage of the proposed three types of level crossing control systems in terms of safety.

Safety Assessment of Closed-Loop Level Crossing Control Systems by Means of STAMP (Systems-Theoretic Accident Model and Processes)