lo ▁T - ban ed rift ) ▁and ▁the ▁rolling ▁stock ▁is ▁owned ▁by ▁the ▁subs idi ary ▁Os lo ▁Vog ns elsk ap . ▁All ▁operations ▁are ▁conducted ▁on ▁contract ▁with ▁R uter , ▁the ▁public ▁transport ▁authority ▁for ▁Os lo ▁and ▁Ak ers hus , ▁which ▁oper ates ▁the ▁ticket ▁system ▁and ▁man ages ▁public ▁gr ants . ▁ ▁Through out ▁the ▁history ▁of ▁the ▁Os lo ▁Tr am way ▁and ▁Metro , ▁ 1 5 ▁different ▁companies ▁have ▁owned , ▁constructed ▁or ▁operated ▁parts ▁or ▁all ▁of ▁the ▁network . ▁The ▁first ▁street ▁tr ams ▁in ▁Os lo ▁were ▁built ▁by ▁three ▁different ▁companies , ▁each ▁with ▁their ▁own ▁network . ▁The ▁private ▁Krist ian ia ▁Sp or ve iss elsk ab ▁started ▁with ▁a ▁hor sec ar ▁service ▁in ▁ 1 8 7 5 , ▁but ▁elect r ified ▁their ▁lines ▁after ▁Krist ian ia ▁Ele ktr iske ▁Sp or ve i ▁started ▁with ▁electric ▁tr ams ▁in ▁ 1 8 9 4 . ▁Between ▁ 1 8 9 9 ▁and ▁ 1 9 0 5 , ▁the ▁municipality ▁operated ▁street ▁tr ams ▁through ▁Krist ian ia ▁Kommun ale ▁Sp or ve ie . ▁Starting ▁in ▁ 1 8 9 8 , ▁the ▁private ▁Hol men kol ban en , ▁and ▁later ▁the ▁municipal ▁Ak ers ban erne ▁and ▁private ▁E ke berg ban en , ▁built ▁sub urban ▁light ▁rail ▁systems . ▁In ▁ 1 9 2 4 , ▁the ▁city ▁took ▁over ▁the ▁street ▁tr ams ▁and