 Next followed the section from Holtet to Kastellet on 12 February 1931, and finally from Sjømannsskolen to Sportsplassen on 30 September 1931.This occurred at the same time the Simensbråten Line was built, as a branch from Jomfrubråten to Simensbråten.Construction of the Simensbråten Line started in December 1928;
and this resulted in the Ekeberg Line past Jomfrubråten being moved.