The Shaoshan 3B (Chinese: 韶山3B/大3BThe 4000 series SS3 Electric Locomotive have been called "SS3B" at early, but has not been approved by Ministry of Railways. China Railfans called 4000 series SS3 Electric Locomotive with "Little 3B". SS3B Electric Locomotive have been called "Big 3B" by China Railfans.) is a type of electric locomotive used on the People's Republic of China's national railway system. This locomotive was built by the Ziyang Electric Locomotive Works. The power supply was industrial-frequency single-phase AC, and the axle arrangement Co-Co+Co-Co.

SS3B Electric Locomotive is a twelve shaft fixing reconnection heavy freight electric locomotive which based on two six-axle locomotives connected.

Named locomotives SS3B-5001: "Pioneer in power of God" (Chinese: 先锋力神)

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Main users SS3Bs have been used by several users: China Railway Corporation Chengdu Railway Bureau Nanning Railway Bureau Guangzhou Railway Group Co., Ltd. Kunming Railway Bureau Xi'an Railway Bureau Xiaoyi-Liulin RailwayXiaoyi-Liulin Railway, is a 115.4-kilometre railway in Shanxi, China opened in 1997. Its start point is at Xiaoyi and ends at Liulin. Dongsheng-Wuhai RailwayDongsheng-Wuhai Railway, is a 315.753-kilometre railway in Inner Mongolia, China opened in 2008. Its start point is at Dongsheng and ends at Wuhai.

Manufacturers SS3Bs have been manufactured by several companies: Zhuzhou Electric Locomotive Works (0001~0119) Datong Electric Locomotive Works (6001~6129) Ziyang Locomotive Works (5001~5104) Dalian locomotive works (7001)

See also China Railways SS1 China Railways SS3 China Railways SS4

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