China Railways Class SS7
| SS7 Electric Locomotive 韶山7型电力机车 |
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SS7-0026, Liuzhou Locomotive Depot, 2016
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| Type and origin | |
|---|---|
| Power type | Electric |
| Builder | Datong Electric Locomotive Works |
| Model | SS7 |
| Build date | 1992–2007 |
| Total produced | 113 |
| Specifications | |
|---|---|
| Configuration: |
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| • 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.
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 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.
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Wikipedia