The paper is concerned with an organizational, structural and functional model of the diagnostic center (DC) in the train, developed by the authors. The DC in the train is a new form of mobile specialized polyclinical aid to the population living in the area of railway stations. The purpose of the model is to draw nearer high-qualified counselling and diagnostic services and prophylactic aid to railway workers. The DC in the train was tried and introduced into western Siberia railway practice. The results of DC in the train establishment are described as is the efficacy of the automated system of early diagnosis of chronic noninfectious diseases, employed under DC conditions.