The Shaoshan 7 (Chinese: 韶山7) is a type of electric locomotive used on the People's Republic of China's national railway system. They are widely used on electrified lines in the southwest part of China.
The first SS7 was built in 1992 in Datong.In 1997, SS7s were used in Nanning-Kunming Railway. However, SS7s frequent failure. Therefore, Datong Electric Locomotive Works made improvements to SS7s. It was reduced to just four cases in one year in 2004.
SS7 Electric Locomotive was still produced as of 2007. Most of SS7s belong to Nanning Railway Bureau. However, 17 SS7s belong to Nanning Locomotive Depot, 95 SS7s belong to Liuzhou Locomotive Depot since March 2016. The last two SS7s(8112 and 8113) belong to Xiaoyi-Liulin Railway, which located in Shanxi.
Derivatives of SS7 include SS7B, SS7C, SS7D and SS7E.
In 1997, Datong Electric Locomotive Works developed SS7B Electric Locomotive. However, there were only two SS7Bs manufactured. Two SS7Bs' each axis axle load 25 tons.
At first, two SS7Bs belong to Kunming Locomotive Depot, Kunming Railway Bureau, later two SS7Bs transfer with Nanning Locomotive Depot, Nanning Railway Bureau. In 2005, SS7B-0001 was destroyed in an accident which happened in Nanning-Kunming Railway.
In 1998, Datong Electric Locomotive Works and Zhuzhou Electric Locomotive Research Institute, Chengdu Locomotive and Rolling Stock Works developed SS7C Electric Locomotive. There were 171 SS7Cs manufactured.
SS7Cs' each axis axle load 22 tons, and support head-end power.
In 1999, Datong Electric Locomotive Works and Zhuzhou Electric Locomotive Research Institute, Chengdu Locomotive and Rolling Stock Works developed SS7D Electric Locomotive. There were 59 SS7Ds manufactured, and belong to Xi'an Locomotive Depot, Xi'an Railway Bureau.
SS7D use lightweight design, each axis axle load 21 tons, and support head-end power. Its maximum speed is 170 km/h.
In 2001, Datong Electric Locomotive Works and Dalian Electric Traction R & D Center, Dalian Locomotive & Rolling Stock Works developed SS7E Electric Locomotive. There were 146 SS7Es manufactured.
SS7E use lightweight design, however its axle arrangement is Co'Co '. Each axis axle load 21 tons, and support head-end power. Its maximum speed is 170 km/h.
Two SS7s and a HXD3C in Liuzhou Locomotive Depot, December 2016.
"4 May's Red Flag", Shilin, 1999
SS7-0082 is a verify locomotive during the development China Railways SS7C.
SS7E-0097 in Beijing West Railway Station.
SS7s have been manufactured by several companies:
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