Gullfisk

Class B and Class E, normally referred to as Gullfisk (Norwegian for "goldfish"), were a class of 46 trams built by Strømmens Værksted and Skabo Jernbanevognfabrikk for Oslo Sporveier and Bærumsbanen of Oslo, Norway, in 1937 and 1939. They were the first aluminium trams to operate on the Oslo Tramway and the first bogie trams to operate on street lines. They had contemporary modern electronic equipment, a streamlined shape, and comfortable accommodation. Until 1964, they were also faster than any other Norwegian tramcar or suburban railcar.

Six prototype trams were delivered by Strømmen in 1937, with four different motor solutions, from AEG, Siemens, Vickers and Norsk Elektrisk & Brown Boveri (NEBB). None of these were particularly successful, and the 40 serial production trams used conventional motors from ELIN. These were delivered in 1939, with 20 (class E) being used by Oslo Sporveier mainly on the Kjelsås Line, but also on other services. The remaining 20 trams (class B) were leased to Bærumsbanen, that used them on the Kolsås and Østensjø Lines, and later on the Ekeberg Line.