Tyholt tunnel
The 310th longest tunnel in the world
The Tyholt Tunnel is a 2,785-meter (9, 137 ft) railway tunnel which runs between Lerkendal and Lademoen on the Stavne–Leangen Line in Trondheim, Norway. The line takes its name for passing under the neighborhood of Tyholt and only sees regular freight traffic. Construction began by the Wehrmacht during the German occupation of Norway from 1940 to 1945, but the project was never completed. The Norwegian State Railways (NSB) resumed the work in the 1950s. Part of the tunnel was built using cut-and-cover, part using a tunneling shield and most of it was blasted. It opened on 1 June 1957.
Tunnel data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).