When the Ofotbanen railway was to be built, the Norwegian military demanded a special bridge on the track – a bridge that could be destroyed to stop enemy train transport. Sweden was probably a conceivable enemy, but it was Russia the Norwegians feared. Finland had been incorporated into Russia in 1809, and the new railway Luleå–Narvik would pass russian territory within a few kilometres.
The history of the construction of the model of Norddalsbrua can be seen and heard here:
All the historical pictures are from Narvik municipal photo collection managed by Narvik Museum.