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There is no universally agreed classification of human error, nor is there one in prospect. Thus, a taxonomy is usually made for a specific purpose. To seek the types of human errors in the environment of man-machine interface under the railway industry, we develop a cognitive information processing model incorporating the human's mental states. Using the model, this study investigates the types of human errors about the railway workers. Thus, a survey is conducted for railway safety personnel-locomotive engineers, station employees, and train commanders- in Korean railway company. Through the survey that is designed to investigate four types of human errors from the questionnaires composed of thirty questions, we analyze the types of human errors related to railway safety according to affiliated offices, operation shifts, age, and working years.Finally, from the insights of the results some guidelines for the railway safety management are presented.