Organizationally, the construction of the Polar Line started at Finneid. It ran through the Bratthaugen Tunnel before reaching Fauske, where Fauske Station was planned. At the time of German capitulation on 8 May 1945, most of the right-of-way through Fauske was completed. The line continued northwards, crossed Svartosen on a bridge and continued to the lake of Vallvatnet, where a passing loop station was planned. The line continued to Straumen, where a station was planned north of the village. A power station was built at Røyrvatnet. The line continued past the lake of Hellandsjøen. On the section from Hellandsjøen to Buvik, five tunnels were planned and a station at Hellbukta.