Brief synthesisThe Semmering Railway, constructed between 1848 and 1854 over 41 km of high mountains, is one of the greatest feats of civil engineering during the pioneering phase of railway building. In the last and most dramatic section of the whole route, the two-storey curving viaduct goes over the Kalte Rinne, and after passing through the Wolfsberg and the Kartnerkogels, the train passes through the 1,431 m Semmering Tunnel before reaching Semmering station. Criterion (ii): The Semmering Railway represents an outstanding technological solution to a major physical problem in the construction of early railways. Given that the railway line has been in use continuously since its opening in 1854, specific items have worn out and been replaced, and methods for organising and operating railway lines have adapted to changing circumstances. In addition, the property itself is managed by the Austrian Federal Railway Company, advised by an expert on railway preservation.