RAM Assessment of CTCS-1 ATP Based on Enhanced Bayesian Network

China Railway Corporation proposes the upgrading and updating plan of general speed train (train running speed under 160 km/h) to improve the outdated status of general speed railway. The new CTCS-1 Automatic Train Protection (ATP) system will be safer, more reliable and advanced than the existing train control system. In this paper, enhanced Bayesian Network (BN) is first used in CTCS-1 ATP RAM assessment, which is mainly used to analyze the structure of two different ATPs and establish the corresponding enhanced BN models. Finally, the Reliability, Availability, and Maintainability (RAM) of these two different ATPs are obtained and analyzed through enhanced BN simulation model. The assessment results show that the RAM indicators of CTCS-1 modular redundancy ATP and system redundancy ATP can satisfy the requirements of Chinese train control system requirement specifications, but the RAM indicators of CTCS-1 modular redundancy ATP are better than CTCS-1 system redundancy ATP.