China Railways SS7

4 ft 8+1⁄2 in)Wheelbase17,080 mm (56 ft 0 in)Length22,016 mm (72 ft 2.8 in) (between coupler centers)Width3,105 mm (10 ft 2.2 in)Height4,700 mm (15 ft 5 in) ± 30 mm (1.2 in)Axle load23 t (22.6 long tons; 25.4 short tons)Electric system/s25 kV AC CatenaryCurrent pickup(s)PantographTransmissionAC – 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.^[1]

The first SS7 was built in 1992 in Datong. In 1997, SS7s were used in Nanning-Kunming Railway. However, SS7's frequent failure lead to Datong Electric Locomotive Works making improvements to SS7s. Failure 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.^[2] The last two SS7s (8112 and 8113) belong to Xiaoyi-Liulin Railway, which is located in Shanxi.

Derivatives

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

SS7B

In 1997, Datong Electric Locomotive Works developed the SS7B Electric Locomotive. There were only two SS7Bs manufactured, both SS7Bs' each axis axle load 25 tons.^[3]

At first, two SS7Bs belonged to Kunming Locomotive Depot, Kunming Railway Bureau. Later the two SS7Bs were transferred to Nanning Locomotive Depot, Nanning Railway Bureau. In 2005, SS7B-0001 was destroyed in an accident which happened on the Nanning-Kunming Railway.^[4][5]

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. Its maximum speed is 120 km/h (75 mph).

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 (110 mph).

SS7E

In 2001, Datong Electric Locomotive Works and Dalian Electric Traction R & D Center, Dalian Locomotive & Rolling Stock Works developed the 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 (110 mph).

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

• 
  SS7-0076 "4 May's Red Flag", Shilin, 1999
• 
  SS7B-0002, May 2018
• 
  SS7-0082 is a verify locomotive during the development China Railways SS7C.^[1]
• 
  SS7C-0142 locomotive at Wuchangnan Locomotive Depot.
• 
  SS7D-0029 in Xianyang railway station.
• 
  SS7D-0011 in Xi'an railway station
• 
  SS7E-0097 in Beijing West railway station.
• 
  SS7E-0113 in Xi'an 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.)

References

Steam

Standard gauge

AM1 AM2 AM3 AM4 DK1 DK2 DK3 DK4 DK5 DB1 DB2 DB3 DB4 DB5 ET1 ET2 (Henschel) ET2 (Russian) ET3 ET4 ET5 ET6 ET7 FD FN1 FN2 GJ HS JF1 JF2 JF3 JF4 JF5 JF6 JF7 JF8 JF9 JF10 JF11 JF12 JF13 JF15 JF16 JF17 JF18 JF21 JS KD1 KD2 KD3 KD4 KD5 KD6 KD7 KD8 KD9 KD10 KD11 KD12 KD13 KD14 KD20 KD21 KD22 KD23 KD24 KD25 KF LD1 MG1 MG2 MG3 MG4 MG5 MG6 MG7 MG8 MG9 MG10 MG11 MG12 MG13 MG21 MG26 MG33 ML1 ML2 ML3 ML4 MT1 MT2 PL1 PL2 PL3 PL4 PL5 PL6 PL7 PL8 PL9 PL10 PL11 PL12 PL13 PL14 PL20 PL21 QJ RA RM SL1 SL2 SL3 SL4 SL5 SL6 SL7 SL8 SL9 SL10 SL11 SL12 SL13 SL14 SL15 SL16 SL17 SL20 ST1 ST2 ST3 SY TH1 TH2 TH3 TH4 TH5 TH6 TH7 TH8 TH9 TH10 TH11 TH12 TH13 TH14 TH15 TH16 TH17 TH18 TH? TW1 XH XK1 XK2 XK3 XK4 XK5 XK6 XK7 XK8 XK9 XK10 XK11 XK12 XK13 XK14 YJ

Narrow gauge

C2 DK51 FN51 JF51 KD51 KD52 KD55 MG51 MG52 PL51 PL52 RJ SN TH55 XK51 (1) XK51 (2) YC

Diesel

Diesel hydraulic	BJ DFH1 DFH2 DFH3 DFH4 DFH5 DFH6 DFH7 DFH21 NY5 NY6 NY7
Diesel electric	DF DF2 DF3 DF4 DF5 DF6 DF7 DF8 DF9 DF10 DF11 DF11G DF11Z DF12 DF21 HXN3 HXN3B HXN5 HXN5B ND1 ND2 ND3 ND4 ND5 NJ1 NJ2

Electric

DC motor	6G 6G1 6K 6Y2 8G 8K SS1 SS2 SS3 SS3B SS4 SS5 SS6 SS7 SS7B SS8 SS9
AC motor	AC4000 DJ DJ1 DJ2 HXD1 HXD1B HXD1C HXD1D HXD1G HXD2 HXD2B HXD2C HXD3 HXD3A HXD3B HXD3C HXD3D HXD3E