zr cu punching type resistance ring scheme ii for traction motor type 6 fra 6068 of elect loco to drg no skel 4742 alt 1 spec no rdso 2008 el spec 0064 re v 3 str no clw tm 17730 rev 1 warranty period 30 months after the date of delivery quantity tolerance 5 age item category normal total po value variation permitted max 8 lacs