 World War II and the limitations on fuel gave the Ekeberg Line a large increase in traffic, from four million passengers in 1939 to eight million in 1944. Unlike many other Norwegian tramways, the tram vehicles were not confiscated and moved to Germany, because no German tramways used both 1,200 volts and allowed 2.5-meter (8 ft 2 in) wide vehicles. A new depot building was built in 1942 and 1943, which allowed 3.2-meter (10 ft) wide trams.
