▁operating ▁automatic ▁ticket ▁gates ▁( th ose ▁gates ▁were ▁introduced ▁in ▁ 1 2 ▁stations ▁of ▁the ▁Mus ash ino ▁Line ▁in ▁ 1 9 7 3 ; ▁six ▁years ▁later , ▁the ▁H ok us ō ▁Line ▁began ▁testing ▁them ). ▁The ▁introduction ▁of ▁a ▁full - f led ged ▁automatic ▁ticket ▁gate ▁in ▁the ▁metropol itan ▁area ▁happened ▁in ▁ 1 9 9 0 ▁after ▁the ▁priv at ization ▁of ▁J NR . ▁Install ation ▁of ▁platform ▁screen ▁doors ▁in ▁all ▁stations ▁was ▁completed ▁in ▁the ▁ 2 0 0 0 s . ▁ ▁Route ▁data ▁ ▁Dist ance : ▁ 4 0 . 4   km / 2 5 . 1   mi ▁Line ▁ 1 : ▁K ann ai ▁Station - Sh on and ai ▁station ▁ 1 9 . 7   km / 1 2 . 2   mi ▁Line ▁ 3 : ▁K ann ai ▁Station - Az am ino ▁station ▁ 2 0 . 7   km / 1 2 . 9   mi ▁Track ▁gauge : ▁ 1 , 4 3 5   mm ▁Number ▁of ▁stations ▁( including ▁terminal ▁station ): ▁ 3 2 ▁( Line ▁ 1 : ▁ 1 7 ; ▁Line ▁ 3 : ▁ 1 6 ), ▁including ▁ ▁Double ▁track ▁section : ▁Wh ole ▁line ▁Elect r ified ▁section : ▁Wh ole ▁line ▁( DC ▁ 7 5 0 ▁V ▁third ▁rail ) ▁At - grade / e lev ated ▁sections : ▁at ▁K amin ag aya ; ▁from