Modern railway systems are becoming more software concentrated than ever before. Majority of safety and security related functions are monitored and controlled using software. Traditionally safety assurance methodology was focused on hardware with more emphasis on operational aspects than its development process. With the introduction of software in many railway systems especially signalling system, the traditional safety assurance approach needs to be revisited. There are fundamental differences between hardware and software with respect to the failure mechanism and behaviors. The software safety assurance becomes a vital issue, as it has been found that the majority of system accidents happen just because of the failure of safety functions monitored and controlled through Software. Safety analysis of software-based safety functions must be revisited before putting them into operation. Software safety is still an open challenge to transportation industries including Railways. This paper attempts to explain the key issues and challenges towards safety assurance of software intensive railway systems. Paper proposed a unified safety assurance approach for modern railway systems. It utilizes the operational profile of the systems for safety analysis and accordingly combines traditional safety analysis techniques with operational profile. Paper also proposed a further layer of safety justification through the introduction of software safety case.
Unified Safety Assurance Approach for Modern Railway Systems
2025-01-16
312575 byte
Conference paper
Electronic Resource
English
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