platforms, one for the metro and one for the trams. The continues past Ringstabekk, which is only served by the metro. It replaced three disused stations, Tjernsrud, Ringstabek and Egne hjem. Situated from Stortinget, Bekkestua is the terminal station for the tramway, and a major transit hub for central Bærum. Like Jar, it features two sets of different platforms. The shared rail section features both third-rail power supply and overhead wires. The trams have a narrower loading gauge and shorter platforms, making it necessary to provide separate platforms for them. The line continues past Gjønnes and Haslum to Avløs, which is one of the three Oslo Metro depots. After that point, it passes through the stations of Valler to Gjettum and Hauger before reaching the terminus, Kolsås Station, which, situated from Stortinget, is the terminus of line 3 and the station furthest away from the centre of Oslo. Service The Kolsås Line is served by Line 3 of the metro. During regular hours, is operates at a 15-minute headway. It runs along the Røa Line from Smestad to Majorstuen and onwards in the Common Tunnel through the city center. East of the center the Line 3 continues along the Østensjø Line to Mortensrud. Travel time from Kolsås to Smestad is 22 minutes, and from Kolsås to Stortinget is 30 minutes. Operations are carried out by Sporveien T-banen on contract with Ruter, the public transport authority in Oslo and Akershus. The infrastructure itself is owned by Sporveien, a municipal company. Service is provided using MX3000 three- and six-car trains. In 2002 the stations along the line had an average weekday 8,568 boarding passengers. Bekkestua was the busiest with 1,126 daily boarding passengers, while Lysakerelven had the least with 235. Jar is also served by Line 13 of the tramway. It branches off on the east side of Lysakerelven and follows the Lilleaker Line to Skøyen, where it continues as a street tram to the city center along the Skøyen Line. It operates at a ten-minute headway. Travel time to Jernbanetorget is 31 minutes from Bekkestua. In comparison, the metro uses 22 minutes from Bekkestua to Jernbanetorget. Tram operations are carried out by Sporveien Trikken using SL95 trams. History Background Bærum grew as a suburb of Oslo after the Drammen Line of the Norwegian State Railways opened through the southern part of the municipality in 1872. The areas around the railway stations