| DFH2 , DFH5 , DFH6 , DFH7 , DFH21 | |
|---|---|
| Power type | Diesel |
| Builder | DFH2, DFH5, DFH6, DFH7 Ziyang locomotive works[1] DFH2, DFH5, DFH21 Sifang locomotive works[1] |
| Build date | DFH2 1973[1] DFH5 1976-1988[1] DFH6 1981[1] DFH7 1988[1] DFH21 1977 (prototype), 1982 |
| Total produced | DFH2 ? DFH5 >500[2] DFH6 1[1] DFH7 4[1] DFH21 >29 |
| UIC classification | B'B'[1] |
| Length | DFH2 12.400m[1] DFH5 13.700m[1] DFH6 ? DFH7 ? DFH21 12.000m[1] |
| Top speed | DFH2 62km/h[1] DFH5 40km/h[1] DFH6 ? DFH7 ? DFH21 50km/h[1] |
| Power output | DFH2 650kW[1] DFH5 790kW[2][3] DFH6 1740kW[1] DFH7 790kW[1] DFH21 640kW[1] |
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 machines being used, however diesel-hydraulic machines continued to be produced for industrial railways - mainly the China Railways GK classes.[2]
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 DF10H.
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The DHF2 was originally designed by Sifang locomotive works in 1966 as a passenger locomotive of rated power 1470kW, the design did not enter mass production, but in 1973 the design was changed at Ziyang locomotive works to a 650kW power locomotive of top speed 62 km/h (39 mph).[1][img 1][img 2]
The mass was 60t and starting tractive effort 192kN. The locomotive used a 12V180ZL engine and SF2010 transmission.[4]
In comparison to the DFH2 type a number of changes were made for the DFH5; a twin speed tranmission allowing a higher topspeed when running without a heavy load was included, the mass was increased to improve traction.[3]
The DFH5 class was produced in large quantities, the engine was a 12V180ZJ and tranmission ZJ2011, producing 278kN of tractive effort with a mass of 86t and with a top speed of 40km/h. A higher speed was available with a limit of 80km/h and tractive effort reduced to approximately half.[2][img 3]
Variants were produced introduced 1985, with modififactions to improve reliability and performance; the DFH5B and DFH5C, in both the rated power was increased to 920kW, and the mass by 4t. DFH5C was produced for operations in metalworks.[3]
One example was produced for shunting in the chinese port of Huangpu District, Shanghai.[1]
Four units produced for shunting in mines and industrial environments.[1]
Locomotives similar in design to the DFH2 type but built to meter gauge and used as universal locomotives.[1][5] The locomotives were used on the Kunming metre gauge railway, including passenger services.[6][img 4]
30 of the locomotives are also used in Vietnam where they are known as the D10H,[7] in 2009 ten of the engines had Caterpillar Inc. 3512B engines fitted as replacements.[8]
DFH2 0008 and DFH5 0001 are both preserved at the Beijing China Railway Museum.[9]
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