As a 6-axle heavy load freight locomotive, SS6B was successfully developed by Zhuzhou Electric Locomotive Works in 1994 on the base of SS series locomotive. Till now, 148 sets of this type have been purchased by China Railway Ministry and therefore produced for for freight train traction on the lines of Beijing-Guangzhou and Baoji-Feng.

Two same Co bogies are mounted on the locomotive. Rolling nose-type half suspended motor and single side straight-tooth drive are employed.

The carbody is integral supported and welded together with high strength low low alloy steel.

Design speed of design reaches 100km/h and traction transmission system adopts central low inclined pull rod push-pull traction gear. It has a higher utilization coefficient of adhesion.

A traction transformer and two current rectifiers are installed on SS3B. Each rectifier energizes three shunt-wound DC traction motors, which can be separated in case of failure to ensure normal performance of other motors so as to enhance utilization of locomotive.

Regarding to its air brake, DK-1 E-P brake for SS series locomotives is adopted while backup resistance braking is employed for its dynamic brake..

Locomotive control system resorts to microcomputer control, which can realize data transmission, display and storage in locomotive for convenience of failure finding and disposal. With phase voltage regulating and step field weakening, constant current and quasi constant speed characteristics control are achieved.

Layout in driver's cab conforms to UIC617－5.

Type ZD114 Rated power 800 kW Rated voltage 1183V Max. voltage 1020 V Rated current 845A Max. current 1200A Rated rev. 960 r/min Max. rev. 1925 r/min Insulation grade C(200) Poles 6 Cooling method Forced cooling through exterior ventilation Weight： 3680 kg