China Railways SS7 The Shaoshan 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.Design The design of SS7 was influenced by the 6K , an electric locomotive model imported from Japan . 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 Liuzhou Locomotive Depot , Nanning Railway Bureau . The last two SS7s belong to Xiaoyi-Liulin Railway, which located in Shanxi .Derivatives Derivatives of SS7 include SS7B, SS7C, SS7D and SS7E.SS7B 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.SS7C 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 .SS7D 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.SS7E 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.Named locomotive SS7-0076, "May 4th's Red Flag". SS7D-0631,"Steelers Iron Horse".Gallery Manufacturers SS7s have been manufactured by several companies:Datong Electric Locomotive Works Dalian Locomotive & Rolling Stock Works
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