Measurements were carried out in order to improve an assessment of a riveted steel bridge from 1911. Dynamic Amplification factors, DAF, were estimated for different parts of the bridge by measurements of deflections and strains for a train passing over the bridge with different speeds. The measured dynamic amplification factors were considerably lower than the corresponding ones calculated according to available codes. Due to this it was possible to increase the axle load on the bridge from 22.5 to 25 tons.