China Railways DFH6
DFH2 0008
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| Type and origin | |
|---|---|
| Power type | Diesel-hydraulic |
| Builder | DFH2, DFH5, DFH6, DFH7 Ziyang locomotive works DFH2, DFH5, DFH21 Sifang locomotive works |
| Build date | DFH2 1973 DFH5 1976-1988 DFH6 1981 DFH7 1988 DFH21 1977 (prototype), 1982 |
| Total produced | DFH2 ? DFH5 >500 DFH6 1 DFH7 4 DFH21 >29 |
| Specifications | |
|---|---|
| UIC class | B'B' |
| Gauge |
1,435 mm (4 ft 8 1⁄2 in) DFH21 1,000 mm (3 ft 3 3⁄8 in) |
| Minimum curve | (?) |
| Length | DFH2 12.400 m (40 ft 8.2 in) DFH5 13.700 m (44 ft 11.4 in) DFH6 ? DFH7 ? DFH21 12.000 m (39 ft 4.4 in) |
| Transmission | Hydraulic |
| Performance figures | |
|---|---|
| Maximum speed | DFH2 62 km/h (39 mph) DFH5 40 km/h (25 mph) DFH6 ? DFH7 ? DFH21 50 km/h (31 mph) |
| Power output | DFH2 650 kW (870 hp) DFH5 790 kW (1,060 hp) DFH6 1,740 kW (2,330 hp) DFH7 790 kW (1,060 hp) DFH21 640 kW (860 hp) |
| Career | |
|---|---|
| Operators |
China Railways DFH2, DFH5, DFH6, DFH7, DFH21 Vietnam Railways DF10H |
The China Railways "Dongfang Hong" diesel-hydraulic locomotive classes DFH2, DFH5, DFH6 and DFH7 built from the 1970s to 1990s were all used as shunters on the Chinese railway network.
The use of diesel-hydraulic shunters has fallen out of favour on the Chinese rail network, with diesel-electric locomotives being used, however diesel-hydraulic machines continued to be produced for industrial railways - mainly the China Railways GK classes.
The DFH21 class is a meter gauge version of the DFH2, and was used on the Yunnan–Vietnam Railway for both passenger and freight services; the same machines are used on the Vietnam Railways where they are known as the D10H.
The DHF2 was originally designed by Sifang locomotive works in 1966 as a passenger locomotive of rated power 1,470 kW (1,970 hp), the design did not enter mass production, but in 1973 the design was changed at Ziyang locomotive works to a 650 kW (870 hp) power locomotive of top speed 62 km/h (39 mph).
The mass was 60 t (59.1 long tons; 66.1 short tons) and starting tractive effort 192 kN (43,000 lbf). The locomotive used a 12V180ZL engine and SF2010 transmission.
In comparison to the DFH2 type a number of changes were made for the DFH5; a twin speed transmission allowing a higher topspeed when running without a heavy load was included, the mass was increased to improve traction.
The DFH5 class was produced in large quantities, the engine was a 12V180ZJ and transmission ZJ2011, producing 278 kN (62,000 lbf) of tractive effort with a mass of 86 t (84.6 long tons; 94.8 short tons) and with a top speed of 40 km/h (25 mph). A higher speed was available with a limit of 80 km/h (50 mph) and tractive effort reduced to approximately half.
Variants were produced introduced 1985, with modififactions to improve reliability and performance; the DFH5B and DFH5C, in both the rated power was increased to 920 kW (1,230 hp), and the mass by 4 t (3.9 long tons; 4.4 short tons). DFH5C was produced for operations in metalworks.
One example was produced for shunting in the Chinese port of Huangpu District, Shanghai.
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Wikipedia