In May 2014 ADY awarded Alstom a €288m contract to supply 50 type KZ8A double-unit electric freight locomotives, but the order was amended to 40 freight locomotives and 10 passenger units the following year. The order was financed through a loan from a consortium of Societe Generale, BNP Paribas and the French branch of HSBC.

The 160km/h AZ4A is equipped to operate under both the 3.3kV dc and 25kV ac 50Hz ac electrification systems.

The 1520mm-gauge locomotive is certified in accordance with Euro-Asian Council for Standardisation, Metrology and Certification GOST standards.