"Krutbanan" (The gunpowder line) was a secret military railroad in Stockholm, about 3 km long, from the main railway line a bit north of Ulriksdal station to an ammunition depot in Ursvik. "Krutbanan" was never drawn on publicly available map. Already in the 1970's the rail trafic was very sparse there and during the later parts of the 1980's the rails were torn up and removed.