 Designated as the Series 645 in the Yugoslav Railways, these locomotives were later known as the Series 2044 in the Croatian Railways after 1991.Thirty four examples (645.001 - 645.034), of this model were built between February 1981 to August 1984 and are noted with different formats of lettering due to the various ethnicities existing in Yugoslavia at the time.Due to the locomotive's unique designation, the model breaks down into several indications