 The SL79 make up 40 of the 72 trams in the system, supplementing the newer SL95. Following the delivery of the SL95 low-floor trams in 1999 and 2000, Oslo Sporveier has a pure articulated fleet. The newer series has a greater turning radius, heavier axle load and is two-directional. The radius and axle load of the SL95 makes it impossible for it to operate around Majorstuen, requiring lines 11, 12 and 19 to use SL79-units. With the 1999-extension of the Ullevål Hageby Line to Rikshospitalet, the tramway received its first terminus without a balloon loop, making it necessary for lines 17 and 18 to be served only by SL95 units. These also serve line 13, since it is a continuation of the service along the Sinsen Line from Majorstuen. The SL79 operate on the Briskeby, Ekeberg, Frogner, Gamleby, Grünerløkka – Torshov, Kjelsås and Vika Lines. Each service has a ten-minute headway, giving a five-minute interval on section that are served by two lines.
