The Lilleaker Line is a suburban tramway from Skøyen in Oslo westwards to Jar, Bærum in Norway. It is operated by Line 13 from Ljabru to Bekkestua of the Oslo Tramway, operated by Oslo Sporvognsdrift. The line continues on the Oslo Metro west of Jar as part of the Kolsås Line, and as a street tramway on the Oslo tramway system at Skøyen as the Skøyen Line.

The Oslo tram network is the tram system in Oslo, Norway. It consists of six lines with 99 stops and has a daily ridership of 132,000. It is operated by Sporveien Trikken AS, a subsidiary of the municipally-owned Sporveien who maintain the track and 72 tram vehicles on contracts with the public transport authority Ruter. The system operates on standard gauge and uses 750 V DC overhead. Depot, workshops and headquarters are at Grefsen. There is also a depot at Holtet that is home to the technical company InfraPartner, which maintains the track for the tram and metro systems in Oslo, and a small office building for Oslo Sporveier.