China Railways SS7

SS7 Electric Locomotive 韶山7型电力机车
SS7-0026, Liuzhou Locomotive Depot, 2016
Type and origin Power type Electric Builder Datong Electric Locomotive Works Model SS7 Build date 1992–2007 Total produced 113
Specifications Configuration: ​  • UIC Bo'Bo'Bo' (Except SS7E use Co'Co) Gauge 1,435 mm (4 ft 8+1⁄2 in) Wheelbase 17,080 mm (56 ft 0 in) Length 22,016 mm (72 ft 2.8 in) (between coupler centers) Width 3,105 mm (10 ft 2.2 in) Height 4,700 mm (15 ft 5 in) ± 30 mm (1.2 in) Axle load 23 t (22.6 long tons; 25.4 short tons) Electric system/s 25 kV AC Catenary Current pickup(s) Pantograph Transmission AC – DC
Performance figures Maximum speed 100 km/h (62 mph) Power output 4,800 kW (6,400 hp) Tractive effort 485 kN (109,000 lbf) (starting) 351 kN (79,000 lbf) (continuous)

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.

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 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

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.

Named locomotive

• SS7-0076, "May 4th's Red Flag" (Chinese: 五四红旗号).
• SS7D-0631,"Steelers Iron Horse"(Chinese: 钢人铁马号).

Gallery

• 
  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.
• 
  SS7C-0132 locomotive at Xikang Railway near Xi'an.
• 
  SS7D-0029 in Xianyang Railway Station.
• 
  SS7E-0097 in Beijing West Railway Station.

Manufacturers

SS7s have been manufactured by several companies:

• Datong Electric Locomotive Works (Most of SS7s.)
• Dalian Locomotive & Rolling Stock Works (SS7E Electric Locomotive's 7000 Series.)