In 1991 , Oslo Sporveier presented plans involving a rapid transit circle line in Oslo , connecting the newly built hospital Rikshospitalet with the rest of the city . A detailed suggestion was presented by Oslo Sporveier in August 1996 . In the local newspaper Aftenposten Aften there was a debate on whether there should be a ring line from Berg along the National Road 150 towards Gaustad over Rikshospitalet , or whether the Ullevål Hageby Line should be extended from John Colletts plass to Rikshospitalet , thereby creating a correspondence with the Sognsvann Line at the new station Forskningsparken . In the first plans , Berg was meant to be a station on the new ring line . This plan was discarded since local residents feared noise pollution and destroyed lawns . Even though Berg was not made a station on the Ring Line , noise shields was put up along the Sognsvann Line .