The power packs were tested by both Changchun and Beijing Jiatong University before the start of delivery. Each train will be fitted with two RailPack 400DE units which incorporate a 375kW diesel engine and a 345kW generator. The trains will have a maximum speed of 120km\/h in diesel-electric mode, and can be switched between modes quickly. The power packs are designed to operate at temperatures as low as -40oC.\r\nTesting of the first train will start next year in preparation for approval by CRC. Voith says these will be the first hybrid trains to operate in China.