▁uses ▁VB Z ▁Be ▁ 4 / 4 ▁Type ▁Ib ▁rolling ▁stock ▁on ▁a ▁different ▁gauge ▁of ▁ 1 , 0 0 0   mm , ▁rather ▁than ▁ 1 , 4 3 5   mm ▁for ▁lines ▁ 1 - 3 . ▁ ▁In ▁August ▁ 2 0 1 8 , ▁following ▁the ▁introduction ▁of ▁new ▁t rol ley b uses ▁and ▁met ro ▁cars , ▁new ▁partially ▁dom est ically - produ ced ▁tram ▁cars ▁were ▁introduced ▁in ▁Py ong y ang ▁for ▁the ▁first ▁time ▁in ▁dec ades . ▁The ▁cars ▁were ▁recently ▁put ▁to ▁use ▁along ▁the ▁K w ang b ok ▁( L iber ation ) ▁Street ▁line ▁and ▁connect ▁to ▁Py ong y ang ▁Station . ▁It ▁is ▁unclear ▁how ▁many ▁new ▁cars ▁have ▁been ▁added ▁to ▁the ▁line . ▁The ▁new ▁dom est ically - produ ced ▁tram ▁vehicles ▁add ▁LED ▁destination ▁displays ▁but ▁do ▁not ▁appear ▁to ▁include ▁air - condition ing . ▁The ▁tr ams ▁were ▁manufact ured ▁by ▁Py ong y ang ' s ▁Bus ▁Rep air ▁Factory ▁under ▁the ▁domestic ▁Songs an ▁brand , ▁assemble d ▁mostly , ▁but ▁not ▁entirely , ▁with ▁domestic ▁parts . ▁ ▁See ▁also ▁Py ong y ang ▁Metro ▁Tr ams ▁and ▁t rol ley b uses ▁in ▁North ▁Korea ▁Transport ▁in ▁North ▁Korea ▁List ▁of ▁tram ▁and ▁light ▁rail ▁trans it ▁systems ▁ ▁References ▁ ▁Further ▁reading ▁Hay ato ▁K ok ub u , ▁Sh ō gun - s ama ▁no ▁T ets ud ō :