Another committee was created in 1938 to work out plans for a central station. This was the first project to propose a tunnel under the entire city that would branch off from the Drammen Line before Oslo West. The committee proposed two plans, one where all traffic was directed to the new central station and one where the suburban traffic went to Oslo West. It also considered construction of a line north of the city via Grefsen to Oslo East, but this was not recommended. The proposed tunnel below the city was to be 1,660 metres long. The plan also included a twelve-story building for NSB's administration at the station, which at the time was spread around at 14 different locations in the city. The committee delivered its report on 7 December 1939 to the Norwegian Ministry of Labour.