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According to WHO statistics, Iran has one of the highest rates of road fatalities. This adds to the
importance of improving railway network and shifting passengers to it. The most fatal railway accident
of the past decade in Iran (HaftKhan ) occurred on 25 November 2016 in which two passenger trains
collided (rear-end collision); resulting in huge fire and over 40 passengers losing their lives. It made
headlines in the news and severely affected the image of railways in the society. The accident
happened at the distance of 291 kilometres from Tehran on the busiest route of the country (TehranMashhad). The causes of this accident were complex and a mixture of human error, use of new
technology (ATC), equipment failure, natural (freezing cold weather) and some shortcomings in
railway traffic regulations. This paper conducts a fault tree analysis (FTA) of the HaftKhan accident to
identify the root causes. A follow-up STAMP (Systems Theoretic Accident Modeling and Processes)
analysis is done to identify systematic ways of improving safety and avoiding similar accidents to
happen in the future.
International Symposium on Railway System Engineering
ISERSE
Melody Khadem Sameni
Naeimeh Mahdavian
Hossein Ganji