' t ▁any ▁pro tot ypes ▁built . ▁The ▁first ▁series ▁of ▁locomot ives ▁were ▁sent ▁to ▁Ú st í ▁nad ▁Lab em , ▁next ▁two ▁series ▁were ▁sent ▁to ▁Ol om ouc , ▁Ko š ice ▁and ▁Česk á ▁T ř eb ová . ▁Currently , ▁the ▁Č D ▁are ▁units ▁in ▁Česk á ▁T ř eb ová , ▁D ě č ín ▁and ▁Boh um ín ▁and ▁Z SS K ▁units ▁in ▁Ko š ice ▁and ▁Ž il ina . ▁ ▁Modern isation ▁ ▁All ▁ 3 0 ▁locomot ives ▁owned ▁by ▁Č D ▁C argo ▁were ▁re built ▁to ▁class ▁ 3 6 3 . 5 ▁( du al ▁voltage ) ▁by ▁Š k oda . ▁Z SS K ▁announced ▁tender ▁for ▁re building ▁ 1 5 ▁locomot ives ▁class ▁ 1 6 3 / 1 6 2 ▁to ▁class ▁ 3 6 1 , ▁which ▁was ▁won ▁by ▁Ž OS ▁V r út ky . ▁As ▁of ▁January , ▁ 2 0 1 4 , ▁ 5 ▁locomot ives ▁of ▁class ▁ 3 6 1 ▁( du al ▁voltage , ▁max . ▁speed ▁ 1 4 0   km / h ) ▁and ▁ 4 ▁locomot ives ▁of ▁class ▁ 3 6 1 . 1 ▁( du al ▁voltage , ▁max . ▁speed ▁ 1 6 0   km / h ) ▁were ▁built . ▁ ▁Service ▁in ▁other ▁countries ▁ ▁Italy ▁ ▁E . 6 3 0 ▁ ▁Because ▁of ▁the ▁financial ▁problems ▁of ▁Č SD ▁( and