But it was soon recognized that the station was too small. The population of Oslo doubled to 150,000 between 1875 and 1890 and from the opening of the station to 1890, the traffic increased from 400,000 passengers annually to more than a million. The most critical part was the freight section, where the trains had to partially use the main railway for switching. One of the proposed solutions was to build the line from Østfold on a viaduct into the station and elevate it on a level above the other tracks. Another problem arose in 1893, when it had to be decided where the new Gjøvik Line was to terminate. Some suggested a station at Grefsen with one line to Oslo East and one via Majorstuen to Oslo West. The Storting decided in 1895 that the Gjøvik Line was to be built to Oslo East.