▁ 1 8 , ▁ 1 9 9 8 : ▁ 8 0 0 0 ▁series ▁trains ▁debut . ▁ ▁February ▁ 2 5 , ▁ 1 9 9 9 : ▁Kot oni ▁– ▁Mi yan os awa ▁section ▁opens . ▁▁ 2 0 0 2 : ▁ 6 0 0 0 ▁series ▁trains ▁begin ▁to ▁be ▁replaced ▁by ▁ 8 0 0 0 ▁series ▁trains . ▁ ▁July ▁ 7 , ▁ 2 0 0 6 : ▁ 8 0 0 0 ▁series ▁trains ▁optimized ▁for ▁driver - only ▁operation ▁debut . ▁ ▁February ▁ 1 3 , ▁ 2 0 0 8 : ▁Platform ▁edge ▁doors ▁installed ▁at ▁N ang ō - N ana - Ch ō me ▁Station ▁for ▁testing ▁prior ▁to ▁line - wide ▁deployment ▁ ▁August ▁ 3 0 , ▁ 2 0 0 8 : ▁Last ▁ 6 0 0 0 ▁series ▁trains ▁are ▁taken ▁out ▁of ▁service . ▁ ▁January ▁ 3 0 , ▁ 2 0 0 9 : ▁S API CA ▁contact less ▁smart ▁card ▁introduced . ▁ ▁March ▁ 3 , ▁ 2 0 0 9 : ▁Platform ▁edge ▁doors ▁installed ▁at ▁all ▁T ō za i ▁Line ▁stations . ▁ ▁April ▁ 1 , ▁ 2 0 0 9 : ▁T ō za i ▁Line ▁switch es ▁to ▁w an man ▁driver - only ▁operation . ▁ ▁July ▁ 1 3 , ▁ 2 0 0 9 : ▁" W omen ▁and ▁Children ▁Com fort ▁C ars " ▁introduced . ▁ ▁References