In 1938, the Station Committee of 1938 was established to look into a possible connection of the Drammen Line to Oslo Ø and extension of the railway station. Led by Axel Grenholm, the committee recommended one of two alternatives: either establish a branch from the Drammen Line and built a tunnel under the city center, in which all trains would terminate at Oslo Ø. The tunnel was proposed run from Lassons gate west of Oslo V to Fred. Olsens gate, with an intermediate station close to the location of Oslo V. The proposed tunnel would be long and largely run through clay, making construction more difficult and expensive. Alternatively, a branch of Drammen Line should be built around the city and connect with the Gjøvik Line at Grefsen. Commuter trains would continue to run to Oslo V, while regional and intercity trains would run to Oslo Ø. The committee stated that it preferred the former suggestion.