issued in 2004. Political indications state that the line will be prioritized after the Fornebu Line and the extension of the Furuset Line to Akershus University Hospital and that the extension would probably not be carried out until after 2025. Ruter stated the extensions, estimated to cost about 1 billion kroner, in its 2010 long-term statement. A more extensive proposal is to not only extend the Kolsås Line to Rykkinn, but also to build a line from Sandvika to Kolsås and onwards to Rykkinn and possibly Bærums Verk. This could possibly also be combined with a line to Avtjerna, where Bærum Municipality is planning 5,000 single dwellings. Detailed in a 2008 report, both extensions of the metro and construction on an independent people mover system have been put forth. Travel time from Kolsås to Rykkinn is estimated at 4 minutes along a line, largely in tunnel. An additional two additional minutes would be needed to Bærums Verk. Total travel time from Sandvika to Bærums Verk was estimated at 12 minutes. Costs were in 2008 estimated at 2.1 billion kroner from Kolsås to Bærums Verk, alternatively 3.5 billion for the whole route from Sandvika to Bærums Verk. Sporveien Trikken is in the process of buying new trams. Because of their poor technical state and high maintenance costs, the company may choose to replace all its SL95s, despite their age. The tramway is pursuing a shelfware tram mode which has low investment costs and optimized for street running. If the trams are to be used concurrently with the metro, they need to have a reinforced cab to better withstand a head-on collision and automatic train protection. This will make procuring shelfware impossible, while providing worse sight-lines for the motorman and increased damage in case of collisions elsewhere. The increased unit cost per tram would be about 2 to 3.5 million kroner. In addition, the infrastructure at Bekkestua does not allow for trams with the international standard of loading gauge. A 2013 report by Ruter therefore recommended that the tram services from Jar to Bekkestua only run until the SL95 trams are retired. References Oslo Metro lines Oslo Tramway lines Railway lines opened in 1924 1924 establishments in Norway