The Sognsvann Line is served by lines 4 and 5 of the Oslo Metro. Half of line 5 trains operate the full length of the Sognsvann Line, while line 4 and the other half of the line 5 trains branch off after Ullevål stadion and serve the Ring Line. All services operate with a fifteen-minute headway, except during late evenings and weekend mornings. This gives the stations Blindern, Forskningsparken and Ullevål stadion an average five-minute headway to the city center and all stations in the Common Tunnel, and an average ten-minute headway to Nydalen and Storo. On the east side of the city, Line 5 connects with the Ring Line, and makes a full loop before it leaves Oslo on the Grorud Line. Line 4 connects with the Lambertseter Line. Travel time from Stortinget to Sognsvann is 18 minutes. The Oslo Metro is operated by Oslo T-banedrift on contract with Ruter. Transfer to the Kolsås, Røa and Holmenkollen Lines is possible at Majorstuen. Transfer to Oslo Central Station, which serves all mainline trains in Eastern Norway, is available at Jernbanetorget. Most west-bound mainline trains can also be reached at Nationaltheatret. The Oslo Tramway can be reached from Majorstuen and Forskningsparken, as well as in the city center from Jernbanetorget, Stortinget and Nationaltheatret. References Bibliography Oslo Metro lines Railway lines opened in 1934 1934 establishments in Norway