| DF4 东风4 |
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|---|---|
| DF4 locomotives | |
| Power type | Diesel-electric |
| Model | DF4B |
| Build date | 1969 - |
| AAR wheel arr. | C-C |
| Gauge | 1,435 mm (4 ft 8 1⁄2 in) |
| Length | 21,100 mm (69 ft 3 in) |
| Width | 3,309 mm (10 ft 10.3 in) |
| Height | 4,755 mm (15 ft 7.2 in) |
| Locomotive weight | 138 tonnes |
| Engine type | 16V240ZJB |
| Transmission | electric (AC-DC) |
| Top speed | Passenger:120 km/h (75 mph) Freight:100 km/h (62 mph) |
| Power output | 2,430 kW (3,260 hp) |
| Tractive effort | Passenger: 327,500 N (73,600 lbf) starting, 243,000 N (55,000 lbf) continuous Freight: 435,000 N (98,000 lbf) starting, 324,000 N (73,000 lbf) continuous |
| Locomotive brakes | straight air and dynamic |
| Train brakes | JZ-7 air |
| Locale | People's Republic of China |
The DF4 (Chinese: 东风4) is a type of diesel locomotive used in the People's Republic of China. It has been in production since 1969 and is still produced as of 2007 by several local companies. It is the most common locomotive in China and is used for both passenger and freight services.
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The first DF4 was built in 1969 in Dalian. The first 108 locomotives that were built here are the original DF4s using the 16V240ZJ engine. It took seven years to build all 108 locomotives of this type.
Few of the first series DF4 are still in operation, however the first ever is a permanent exhibition at the Beijing Railway Museum.[1]
The DF4A distinguishes itself from first series DF4s with an improved engine, the 16V240ZJA. Production started in 1976 and lasted until 1984.
DF4B are very similar to standard DF4 and DF4A, apart from an improved engine (16V240ZJB). Production started in Dalian in 1984.
The DF4C was supposed to replace the DF4B as the main diesel locomotive in China and comes with several improvements, including a new engine revision (16240ZJC). The first DF4C was produced in 1985 and batch production started four years later, in 1989, and lasted until roughly the end of the 20th century.
The DF4C comes in a different color scheme than the previous DF4s, namely dark blue and later light blue and beige.
The DF4, DF4A, DF4B and DF4C were each produced with two different gear ratios, "passenger" (up to 120 km/h/75 mph) and "freight" (up to 100 km/h/62 mph). The passenger variant was often painted orange.[1]
The DF4D, the most recent DF4 revision, has been produced since 1996 with the 16V240ZJD engine. The passenger versions increased top speed to 145 km/h (90 mph) or 170 km/h (110 mph) for the DF4DK, and a road-switcher version was also introduced.[2]
The DF4DJ, of which only 2 were built had AC drive technology supplied by Siemens. They were China's first AC drive diesel locomotive.[3][4][5][6][7]
The DF4E is a 2 unit locomotive of total power 4.86MW (2x2.43MW)[8]
DF4s have been manufactured by several companies:
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