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|The aerospace and nuclear industries have been applying systematic techniques for assessing the safety of complex technical systems for many years. These techniques such as fault tree analysis, failure mode, and effect analysis, etc., and more recently "expert systems," were developed to formally evaluate systems safety and to determine how hazards can he reduced. The application of formal methods such as expert systems has the potential for further reduction in both frequency and the consequences of mine accidents. This paper presents a general expert system model of diagnostic reasoning and describes its use as an inference method for analysis and problem identification for accidents due to the presence of an open cycle diesel-powered mine cars in underground coal mines.|