During the 1910s, 1920s and 1930s, the network continued to expand, with the most notable addition being the construction of Ekebergbanen, a line up along the hill along the east side of the Oslo Fjord, south of the city.

The tram network reached its greatest extent in 1939 with the opening of the northeastern line to Sinsen.

After World War II, the tram network started being gradually being replaced with diesel buses, closures started in 1947, and in 1960, the city council decided to aim for a complete dismantlement of the entire tram system.

A number of lines had been replaced with the T-bane subway system, and the versatility of buses was attractive to the local politicians.

An order was made for a set of new articulated trams to supplement the aging fleet.

A further renewal of the tram fleet by the addition of Italian double-articulated SL95 cars was also started.

Oslo Sporveier was strapped for cash, and the board passed a decision to close down much of the tram system and replace it with buses.

However, such a drastic change of operations forced a general assembly to meet, and most of the closures were cancelled.

In 2003, the tram system which had been part of Oslo Sporveier, was fissioned out to a separate company, Oslotrikken.

Majorstuen • Bogstadveien • Rosenborg • Briskeby • Riddervolds plass • Inkognitogata • Nationaltheatret • Øvre Slottsgate • Dronningens gate • Jernbanetorget • Storgata • Nybrua • Schous plass • Olaf Ryes plass • Birkelunden • Biermanns gate • Torshov • Sandaker senter • Grefsenveien • Storo • Disen • Doktor Smiths vei • Glads vei • Grefsenplatået • Grefsen stadion • Kjelsåsalleen • Kjelsås Majorstuen • Frogner stadion • Vigelandsparken • Frogner plass • Elisenberg • Lille Frogner allé • Niels Juels gate • Solli • Ruseløkka • Akerbrygge • Kontraskjæret • Øvre Slottsgate • Dronningens gate• Jernbanetorget • Storgata • Nybrua • Schous plass • Olaf Ryes plass • Birkelunden • Biermanns gate • Torshov • Sandaker senter • Grefsenveien • Storo• Disen • Doktor Smiths vei • Glads vei • Grefsenplatået • Grefsen stadion • Kjelsåsalleen • Kjelsås Lilleaker • Sollerud • Furuland • Ullern • Abbediengen • Hoff • Skøyen • Thune • Nobels gate • Skarpsno • Skillebekk • Solli • Nationaltheatret • Øvre Slottsgate • Dronningens gate • Bjørvika • Middelalderparken • Oslo Hospital • Ekebergparken • Jomfrubråten • Sportsplassen • Holtet • Sørli • Kastellet • Bråten • Sæter • Ljabru Rikshospitalet • Gaustadalleen • Forskningsparken • Universitetet Blindern • John Collets plass • Ullevål sykehus • Adamstuen • Stensgata • Bislett • Dalsbergstien • Welhavens gate • Frydenlund • Holbergs plass • Tullinøkka • Tinghuset • Stortorvet • Jernbanetorget • Storgata • Nybrua • Heimdalsgata • Lakkegata skole • Sofienberg • Carl Berners plass • Rosenhoff • Sinsenterrassen • Sinsenkrysset • Grefsen stasjon Rikshospitalet • Gaustadalleen • Forskningsparken • Universitetet Blindern • John Collets plass • Ullevål sykehus • Adamstuen • Stensgata • Bislett • Dalsbergstien • Welhavens gate • Frydenlund • Holbergs plass • Tullinøkka • Tinghuset • Stortorvet • Jernbanetorget • Storgata • Nybrua • Schous plass • Olaf Ryes plass • Birkelunden • Biermanns gate • Torshov • Sandaker senter • Grefsenveien • Storo • Grefsen stasjon Majorstuen • Bogstadveien • Homansbyen • Welhavens gate • Frydenlund • Holbergs plass • Tullinøkka • Tinghuset • Stortorvet • Jernbanetorget • Bjørvika • Middelalderparken • Oslo Hospital • Ekebergparken • Jomfrubråten • Sportsplassen • Holtet • Sørli • Kastellet • Bråten • Sæter • Ljabru On 29 October 2024, an SL18 tram derailed and crashed into an Eplehuset [no] store on Storgata.

[4][5] Amid an ongoing investigation, the driver was charged with breaching Section 3 of the Road Traffic Act (Norwegian: Vegtrafikkloven) in connection with the accident.

It remained in regular passenger service until 1968 and continued to serve as a maintenance vehicle.

647, complete with the classical open platforms, is a replica of an old trailer, built from parts from tram no.