China Railways SS7

SS7

300px SS7 electric locomotive

Type and origin Power type Electric Builder Datong Electric Locomotive Works Model SS7 Build date 1992-2007 Total produced 113

Specifications UIC class 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 collection 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

File:China Railways SS7 0001 20150703.jpg

The first SS7 Electric Locomotive

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 Locomotive Depot, Nanning Railway Bureau. The last two SS7s(8112 and 8113) belong to Xiaoyi-Liulin Railway, which located in Shanxi Province.

Derivatives

Derivatives of SS7 include SS7B, SS7C, SS7D and SS7E.

SS7B

In 1997, Datong Electric Locomotive Works developd 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, the first locomotive was destroyed in a accident which happened in Nanning-Kunming Railway.

Named locomotive

File:SS7-0076.jpg

"May 4th's Red Flag"

• SS7-0076, "May 4th's Red Flag"(Chinese:五四红旗号).

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.)