▁of ▁which ▁kept ▁the ▁Os lo ▁Sp or ve ier ▁name . ▁From ▁ 2 0 0 7 , ▁the ▁ownership ▁of ▁the ▁tr ams ▁and ▁trains ▁was ▁transferred ▁to ▁Os lo ▁Vog ns elsk ap . ▁In ▁ 2 0 0 8 , ▁Os lo ▁Sp or ve ier ▁merged ▁with ▁its ▁Ak ers hus ▁counter part , ▁St or - Os lo ▁Lok alt raf ikk , ▁to ▁create ▁R uter . ▁ ▁__ TO C __ ▁ ▁Oper ators ▁The ▁following ▁table ▁lists ▁companies ▁involved ▁in ▁the ▁operation ▁of ▁the ▁Os lo ▁Tr am way ▁and ▁the ▁Os lo ▁Metro . ▁In frastr ucture ▁own ers ▁( den oted ▁as ▁" in frastr ucture ") ▁only ▁own ▁track ▁and ▁station , ▁le asing ▁these ▁to ▁other ▁companies ; ▁if ▁the ▁less ors ▁only ▁operate ▁trains , ▁and ▁have ▁no ▁track ▁themselves , ▁they ▁are ▁operators ▁( den oted ▁as ▁" operator "). ▁Trans it ▁authorities ▁( den oted ▁as ▁" author ity ") ▁do ▁not ▁perform ▁any ▁operations , ▁instead ▁man aging ▁tick ets ▁and ▁far es , ▁including ▁trans fers , ▁market ing ▁and ▁subs id ies . ▁Rol ling ▁stock ▁own ers ▁( den oted ▁as ▁" rolling ▁stock ") ▁own ▁the ▁trains ▁and ▁tr ams , ▁which ▁are ▁le ased ▁to ▁an ▁operator . ▁Integr ated ▁companies ▁( den oted ▁" integr ated ") ▁manage ▁all ▁before - ment ioned ▁aspects . ▁ ▁The ▁list ▁further ▁spec ifies ▁the ▁lines ▁or ▁category ▁of ▁lines ▁the ▁company ▁operated