▁are ▁Por ir ua , ▁Water lo o ▁( in ▁Lower ▁H utt ) ▁and ▁Johnson ville . ▁Most ▁stations ▁are ▁served ▁by ▁only ▁one ▁line . ▁ ▁Most ▁trains ▁are ▁the ▁F P ▁class ▁Mat ang i ▁electric ▁multiple ▁units , ▁in ▁sets ▁of ▁two ▁to ▁eight ▁cars , ▁introduced ▁from ▁ 2 0 1 1 . ▁They ▁disp la ced ▁the ▁older ▁DM ▁class ▁English ▁Electric ▁units , ▁the ▁last ▁of ▁which ▁were ▁with dra wn ▁from ▁service ▁in ▁ 2 0 1 2 , ▁and ▁the ▁EM ▁class ▁G anz ▁M av ag ▁units , ▁the ▁last ▁of ▁which ▁were ▁with dra wn ▁from ▁service ▁in ▁ 2 0 1 6 . ▁The ▁W air ar apa ▁line ▁beyond ▁Upper ▁H utt ▁is ▁not ▁elect r ified , ▁so ▁Master ton ▁services ▁use ▁dies el - h au led ▁SW ▁and ▁SE ▁class ▁carri ages . ▁ ▁There ▁are ▁long - distance ▁trains ▁to ▁Pal mer ston ▁North ▁( the ▁Capital ▁Connection ▁comm uter ▁train ) ▁and ▁A uck land ▁( the ▁Northern ▁Explorer ). ▁These ▁are ▁not ▁part ▁of ▁the ▁Well ington ▁transport ▁system . ▁ ▁History ▁ ▁Electric ▁sub urban ▁services ▁began ▁in ▁July ▁ 1 9 3 8 , ▁following ▁the ▁opening ▁of ▁the ▁T awa ▁flat ▁deviation ▁of ▁the ▁North ▁Island ▁Main ▁Tr unk ▁( N IM T ). ▁The ▁Johnson ville ▁Line , ▁the ▁former ▁route ▁of ▁the ▁N IM T ▁out ▁of ▁the ▁capital , ▁was ▁the ▁first ▁line ▁to ▁be ▁elect r ified