▁▁ ▁" xx " ▁corresponds ▁to ▁the ▁set ▁number . ▁ ▁C ars ▁ 3 , ▁ 5 , ▁and ▁ 9 ▁are ▁each ▁fitted ▁with ▁two ▁T - PT 7 1 5 4 - A ▁single - arm ▁p ant ograph s . ▁▁ 3 rd - batch ▁ 1 0 - 3 0 0 ▁series ▁ 1 0 - car ▁sets ▁ ▁The ▁ 3 rd - batch ▁ 1 0 - 3 0 0 ▁series ▁sets ▁( 1 0 - 4 9 0 ▁to ▁ 1 0 - 5 1 0 ) ▁delivered ▁from ▁ 2 0 1 3 ▁are ▁formed ▁as ▁shown ▁below ▁with ▁six ▁mot ored ▁( M ) ▁cars ▁and ▁four ▁tra iler ▁( T ) ▁cars . ▁▁ ▁" xx " ▁corresponds ▁to ▁the ▁set ▁number . ▁ ▁C ars ▁ 3 , ▁ 7 , ▁and ▁ 9 ▁are ▁each ▁fitted ▁with ▁two ▁T - PT 7 1 5 4 - A ▁single - arm ▁p ant ograph s . ▁▁ 4 th - batch ▁ 1 0 - 3 0 0 ▁series ▁ 1 0 - car ▁sets ▁Three ▁fourth - batch ▁ 1 0 - car ▁sets ▁were ▁introduced ▁from ▁May ▁ 2 0 1 5 . ▁These ▁sets ▁differ ▁from ▁earlier ▁built ▁sets ▁by ▁the ▁addition ▁of ▁a ▁light ▁green ▁stri pe ▁running ▁alongside ▁the ▁bodies , ▁including ▁on ▁the ▁doors . ▁The ▁fourth - batch ▁sets ▁( 1 0 - 5 2 0 ▁on ward ) ▁are ▁formed ▁as ▁shown ▁below