Promoting railways as a sustainable, innovative, interconnected and safe means of transport, of both passengers and goods, and strengthening its contribution to the economy, industry and trade are some of the priorities which have involved the whole world in the last decades. Nowadays, on Norwegian soil, approximately 50 to 90 per cent of the goods are transported on rails over the entire territory. Because of increasing service loads and train speeds, rail authorities are therefore paying attention to predict and possibly extend the remaining service life of railway infrastructures.???? Accordingly, the aim of this study is to estimate the condition of an existing historical steel railway bridge in order to define cost-effective maintenance strategies and avoid the sudden interruption of the regular service with considerable economic losses.