U ) ▁train ▁type ▁operated ▁in ▁Japan ▁by ▁the ▁private ▁railway ▁operator ▁H ank y u ▁Railway ▁since ▁ 1 9 7 5 . ▁ ▁Oper ations ▁The ▁ 4 - car ▁ 6 3 0 0 ▁series ▁trains ▁operate ▁on ▁the ▁H ank y ū ▁Ar ashi y ama ▁Line . ▁ ▁Form ations ▁▁ 8 - car ▁sets ▁ ▁, ▁a ▁total ▁of ▁ 2 4 ▁vehicles ▁are ▁in ▁operation , ▁formed ▁as ▁two ▁ 6 - car ▁sets ▁and ▁three ▁ 4 - car ▁sets . ▁▁ 4 - car ▁sets ▁The ▁three ▁ 4 - car ▁sets , ▁number ed ▁ 6 3 5 1 ▁to ▁ 6 3 6 3 , ▁are ▁formed ▁as ▁follows , ▁with ▁two ▁mot ored ▁( M ) ▁cars ▁and ▁two ▁un power ed ▁tra iler ▁( T ) ▁cars . ▁ ▁The ▁" M " ▁cars ▁are ▁fitted ▁with ▁two ▁sc iss ors - type ▁p ant ograph s . ▁▁ 6 - car ▁sets ▁The ▁two ▁ 6 - car ▁sets , ▁number ed ▁ 6 3 5 0 ▁and ▁ 6 3 5 4 ▁( K y ō - Tra in ), ▁are ▁formed ▁as ▁follows , ▁with ▁four ▁mot ored ▁( M ) ▁cars ▁and ▁two ▁un power ed ▁tra iler ▁( T ) ▁cars . ▁ ▁The ▁two ▁" M " ▁cars ▁are ▁each ▁fitted ▁with ▁two ▁sc iss ors - type ▁p ant ograph s . ▁ ▁History ▁The ▁H ank y u ▁ 6 3 0