 The line was originally connected to <unk> via Stortorvet . After the line was taken over by KSS , it was given service number 9 and operated with a twelve @-@ minute headway , connecting via the city center to Skøyen on the Skøyen Line . When the Sinsen Line opened , the souther part of the Rodeløkka was also served by Line 13 , which gave a six @-@ minute headway south of <unk> gate . From 29 June 1924 , after the takeover of Oslo Sporveier , the headway was changed to fifteen minutes . From 29 May 1927 , Line 13 was replaced with Line 12 , and from 19 June , Line 9 became Line 17 , which continued along the Ullevål Hageby Line on the other side of the city center . From 19 January 1937 , the Sinsen service was also operated by Line 3 . From 10 December 1939 , Gullfisk trams were put into service on the Sinsen services . With the reopening of the Rodeløkka Line in 1955 , the service was taken over by Line 13 , which used SM53 trams . Ridership on the new line was less than predicted , and from 1959 , the line was only served during rush @-@ hour and started to turn at the Eastern Railway Station in the city center . 
