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The dynamic investigation of railway bridges with ballast bed has been continued by the Institute of Structural Engineering – Research Center of Steel Structures. Now the results of the comparison of measurement and calculation with the already developed model for the ballast bed for railway bridges are shown for an operated bridge. These results demonstrate the practical application of the model. Nevertheless new detected dynamic effects on operated bridges have to be investigated furthermore for an exact dynamic modelling of the ballast substructure of railway bridges.