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China Railway SS1
originally 6Y1
China | 1958 | 826 produced
SS<sub>1</sub>-0681 at the China Railway Museum
SS1-0681 at the China Railway Museum
Tyg728

The SS1 was the first mainline electric locomotive to be manufactured in China. The “SS” stood for “Shaoshan”, Mao’s birthplace. The first seven prototypes with the designation 6Y1 were built between 1958 and 1966 with Soviet help and were based on the ВЛ60. In the area of electronics, experience from the 6Y2 supplied by Alsthom was also incorporated.

In the years that followed, the prototypes were continuously improved. The actual production locomotives were ultimately only built between 1980 and 1988. Including all prototypes, 826 SS1s were built, which were used for various types of trains and the first of which had reached the end of their service life after almost 30 years. The last one ran for the last time on September 19, 2014.

General
Built1958-1988
ManufacturerZhuzhou Electric Locomotive Works
Axle configC-C 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length66 ft 9 7/8 in
Fixed wheelbase15 ft 1 1/8 in
Service weight304,238 lbs
Adhesive weight304,238 lbs
Axle load50,706 lbs
Power
Power sourceelectric - AC
Electric system25,000 V 50 Hz
Hourly power5,632 hp (4,200 kW)
Continuous power5,069 hp (3,780 kW)
Top speed56 mph
Starting effort109,482 lbf
Power Plant
Boiler
Calculated Values
electric locomotive
freight
passenger
last changed: 12/2023
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