) ▁train ▁type ▁that ▁was ▁operated ▁by ▁the ▁Tokyo ▁sub way ▁operator ▁Tokyo ▁Metropolitan ▁Bureau ▁of ▁Transport ation ▁( To ei ) ▁on ▁the ▁To ei ▁Shin ju ku ▁Line ▁in ▁Tokyo , ▁Japan , ▁from ▁ 1 9 7 8 ▁until ▁ 2 0 1 8 . ▁ ▁Oper ations ▁The ▁ 1 0 - 0 0 0 ▁series ▁operated ▁on ▁the ▁To ei ▁Shin ju ku ▁Line ▁between ▁ ▁and ▁, ▁and ▁also ▁on ▁inter - running ▁services ▁over ▁the ▁Ke io ▁Line ▁from ▁Shin ju ku ▁as ▁far ▁as ▁ ▁on ▁the ▁Ke io ▁S ag ami h ara ▁Line . ▁ ▁Form ations ▁By ▁April ▁ 2 0 1 7 , ▁the ▁fleet ▁consisted ▁of ▁five ▁eight - car ▁sets ▁( sets ▁ 1 0 - 2 4 0 ▁to ▁ 1 0 - 2 8 0 ) ▁with ▁six ▁mot ored ▁( M ) ▁cars ▁and ▁two ▁tra iler ▁( T ) ▁cars , ▁formed ▁as ▁shown ▁below , ▁with ▁car ▁ 1 ▁at ▁the ▁Shin ju ku ▁end . ▁▁ ▁" xx " ▁corresponds ▁to ▁the ▁set ▁number . ▁ ▁C ars ▁ 3 ▁and ▁ 7 ▁were ▁each ▁fitted ▁with ▁two ▁lo zen ge - type ▁p ant ograph s , ▁and ▁car ▁ 5 ▁has ▁one . ▁ ▁Inter ior ▁Pass enger ▁accommod ation ▁consisted ▁of ▁longitud inal ▁ben ch ▁se ating ▁throughout . ▁W heel ch air ▁spaces ▁were ▁added ▁when ▁the ▁original ▁six - car ▁sets ▁were ▁length ened ▁to ▁eight - car