This paper presents an approach of defining and classifying degradation processes in concrete railway bridges and also their relations with damages classified in regard to their effects. This work focuses also on the references to the NDT methods, which can be used for identification of damages and degradation processes. The aim of this work is creating basis for unification of bridge condition assessment and for application of expert tools supporting evaluation process. In order to use a common procedure of structure condition assessment an unified taxonomy — accepted on international level - is needed.The proposed taxonomy of basic degradation mechanisms identified in concrete railway bridges is presented in Figure 1.Relationships between the degradation mechanisms and the basic types of damages, based on analysis of many practical cases, are presented in the Table 1.
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