▁Y ok oh ama . ▁Since ▁Sak ur ag ich o ▁is ▁located ▁in ▁the ▁middle ▁of ▁the ▁town ▁and ▁the ▁Min atom ira i ▁district , ▁the ▁line ▁virt ually ▁travers es ▁the ▁city ▁center ▁of ▁Y ok oh ama . ▁Line ▁ 3 ▁runs ▁from ▁K ann ai ▁to ▁Az am ino ▁in ▁A oba - ku , ▁travers ing ▁through ▁Y ok oh ama ▁Station , ▁Kan ag awa - ku , ▁Shin - Y ok oh ama , ▁and ▁Koh oku ▁New ▁Town . ▁Based ▁on ▁the ▁locations ▁of ▁the ▁line ' s ▁term ini ▁( Sh on and ai ▁in ▁the ▁south west , ▁Az am ino ▁in ▁the ▁north west ), ▁the ▁line ▁forms ▁a ▁backwards ▁" C " ▁shape . ▁It ▁can ▁also ▁be ▁said ▁that ▁the ▁line ▁provides ▁a ▁fe eder ▁route ▁to ▁other ▁private ▁railway ▁lines ▁that ▁traverse ▁Y ok oh ama ▁and ▁its ▁sub ur bs . ▁ ▁The ▁Blue ▁Line ▁is ▁one ▁of ▁three ▁heavy - ra il ▁sub way ▁lines ▁in ▁the ▁K anto ▁region ▁to ▁use ▁standard ▁gauge ▁track ▁and ▁a ▁third ▁rail ▁elect r ification ▁system ▁( the ▁others ▁being ▁the ▁G in za ▁and ▁Mar un ouch i ▁lines ▁of ▁Tokyo ▁Metro ). ▁As ▁of ▁ 2 0 1 8 , ▁this ▁is ▁the ▁most ▁recent ▁sub way ▁line ▁with ▁third ▁rail ▁elect r ification ▁to ▁be ▁constructed ▁in ▁Japan . ▁Begin ning ▁in ▁ 1 9 7 2 , ▁some ▁private ▁rail ro ads ▁in ▁Tokyo ▁began