The former has been preferred by the Rail Administration, while the latter—which would cost NOK 1 billion more—has been preferred by the municipality. There are no intermediate commuter stations between Skøyen and Lysaker, so there is little regularity or speed potential to gain from the construction, since the Oslo Tunnel from Skøyen to Oslo Central Station will still remain a bottleneck with only two tracks. Advocates have claimed that there is no gain from building this section without building two additional tracks all the way to the central station.
The Rail Administration has chosen the first option, while the municipality prefers the second, which is NOK 1 billion more expensive. There are no intermediate commuter stations between Skøyen and Lysaker, so there's little potential for regularity or speed improvements from construction. The Oslo Tunnel from Skøyen to Oslo Central Station will still be a bottleneck with only two tracks. Advocates argue that building this section without adding two additional tracks would yield no benefits.