on 18 july 1947, the first (and only) double track section of the dedicated right-of-way was built. inspired by oslo, where all the suburban lines had this, was rebuilt between breidablikk and nordre hoem. this gave a lot better regularity, since the two trams could meet anywhere along the section, and thus both trams would not become delayed if one was. by 1949, all the track had been upgraded to 35 kg/m, and the speed could be increased from to .