Station. Nydalen is the only underground station on the Ring Line. The escalators leading down to the platform features The Tunnel of Light, an artistic presentation of sound and colour around the passengers as they ascend from or to descend to the station. The artwork contains 1800 lights and 44 speakers. Nydalen also serves as a bus hub. Storo opened as a tram station as part of the Grünerløkka–Torshov Line on 28 November 1902. It is located about 200 meters from Grefsen Station of the Gjøvik Line. The Norwegian National Rail Administration is planning to move the station platform so there can be direct transfer between NSB Gjøvikbanen's commuter rail services, and the metro. Storo functions as a bus and tram hub; it serves line 11, 12 and 18 on the Grünerløkka–Torshov- and Kjelsås Line, and line 17 on the Sinsen Line. Sinsen opened on 20 August 2006, three years after the two other stations. The station is located close to, but not adjacent, to the tram stop Sinsenkrysset on the Sinsen Line (tram no. 17). Located at the interchange between Ring 3 and Trondheimsveien, it also serves as a bus hub. Lørensvingen, built in 2016, connected the Ring and Grorud Line. It splits from the Ring Line south of Sinsen, and run in tunnel until it connects to the Grorud Line west of Økern. In the tunnel the new station, Løren, was built. The line allows metro trains to run directly from the Grorud Line to the Ring Line, and thus pass from east to west without passing through the packed Common Tunnel. It was part of the political compromise Oslo Package 3, completed by 2016. Service When operating a full circle route, trains start through the Common Tunnel. If running clockwise, they pass through all the common stations (Tøyen, Grønland, Jernbanetorget, Stortinget, Nationaltheatret and Majorstuen). They head north on the Sognsvann Line, stopping at Blindern, Forskningsparken and Ullevål stadion. The Ring Line proper then splits off, and the trains serve Nydalen, Storo and Sinsen, before Carl Berners plass on the Grorud Line. After that, the trains again enter the Common Tunnel at Tøyen. Line 5 operates the entire ring with a 15-minute headway. From east to west, trains on line 5 enter the common tunnel from the Grorud Line then make a full clockwise circle around the Ring Line, including a second pass of the common tunnel, before