ives ▁from ▁the ▁ 1 9 5 0 s ▁are ▁still ▁being ▁used , ▁although ▁most ▁of ▁them ▁have ▁been ▁replaced ▁by ▁T U 7 ▁dies el ▁locomot ives ▁or ▁T U 7 A ▁dies el ▁locomot ives . ▁The ▁production ▁of ▁narrow ▁gauge ▁locomot ives ▁was ▁dis cont in ued ▁in ▁the ▁ 2 0 0 0 s ▁because ▁of ▁the ▁dem ise ▁in ▁narrow ▁gauge ▁rail ways ▁in ▁Russia , ▁such ▁as ▁forest ▁rail ways , ▁pe at ▁rail ways ▁and ▁industrial ▁rail ways , ▁and ▁this ▁led ▁to ▁a ▁lack ▁of ▁suitable ▁new ▁or ▁second - hand ▁locomot ives ▁for ▁the ▁children ' s ▁rail ways . ▁ ▁Development ▁of ▁the ▁T U 1 0 ▁▁ ▁The ▁K amb ark a ▁Engineering ▁Works ▁began ▁in ▁ 2 0 0 8 ▁with ▁the ▁development ▁of ▁a ▁modern ▁dies el ▁locomot ive ▁especially ▁for ▁use ▁at ▁children ' s ▁rail ways . ▁Based ▁on ▁the ▁experience ▁with ▁older ▁models , ▁the ▁following ▁innov ations ▁were ▁implemented : ▁The ▁locomot ives ▁have ▁two ▁equal ▁c abs ▁with ▁an ▁erg onom ically ▁designed ▁dash ▁board ▁and ▁H V AC ▁( he ating , ▁vent ilation , ▁air ▁condition ). ▁They ▁have ▁a ▁dies el ▁engine ▁Ja M Z ▁ 6 5 6 3 . 1 0 ▁( Я М З ▁ 6 5 6 3 . 1 0 ) ▁with ▁ 1 6 9   k W ▁at ▁ 1 9 0 0 ▁r pm ▁and ▁a ▁four ▁g ear ▁hyd ra ul ic