Abstract
BP-Risk is a semi-quantitative approach for railway risk assessments, which has been published and validated. Semiquantitative methods are a combination of qualitative and quantitative approaches. They can be defined as qualitative, model-based' risk assessment methods. This means, that for semi-quantitative risk assessment methods, numerical (quantitative) values are assigned to qualitative scales. This article shows how a semi-quantitative risk assessment method can be applied for the estimation of safety requirements for wayside derailment detectors. Wayside derailment detectors were recently developed as a part of modern wayside train monitoring systems to guarantee operational safety in centralised and remote controlled railway operation. (5 pages)
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