 It also involved the Romanian companies Electroputere Craiova and UCM Reşiţa.Thus the Romanian party delivered to Yugoslavia a number of 103 Co’Co locomotives of the 461 JŽ series and sub-assemblies for 130 Bo’Bo locomotives of the 441 JŽ series, delivered to Romania and registered with CFR under the number 040-EC (Class 43) between 1973 and 1984.The Yugoslavian locomotives derived directly from the already renowned prototype ASEA RB1 improved in the mechanical construction under the RC1 series pattern.