China Railways DFH shunting locomotives

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.

China Railways standard gauge

DFH2

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]

DFH5

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]

DFH6

One example was produced for shunting in the chinese port of Huangpu District, Shanghai.^[1]

DFH7

Four units produced for shunting in mines and industrial environments.^[1]

Metre gauge

DFH21

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]

Preserved locomotivess

DFH2 0008 and DFH5 0001 are both preserved at the Beijing China Railway Museum.^[9]

References

1. ^ ^{a b c d e f g h i j k l m n o p q r s t u v w} 东方红型内燃机车 , The East is Red Diesel locomotive , www.kepu.net.cn
2. ^ ^{a b c d} DFH5 东方红5 , www.railwaysofchina.com
3. ^ ^{a b c} 海子铁路网社区 » 中国内燃（干线） » 东方红5型(DFH5)内燃机车 , (DF5 locomotive) , technical drawing and description , bbs.hasea.com
4. ^ 中国铁路东方红2型(DFH2)内燃机车 , China Railway "Dongfang Hong" 2 (DFH2) Diesel locomotive , www.hudong.com
5. ^ 中国機関車大全 液体式ディーゼル機関車編 : 東方紅２１型（ＤＦＨ２１） Chinese locomotives : diesel hydraulics , section "DFH21" , www.chinarailway.jp
6. ^ South China March 2005 , section "Kunming meter gauge" , Peter Patt, Jan Schirling , 2005 , www.sy-country.co.uk
7. ^ Danh sách đầu máy D10H tại Việt nam , Info on D10H in Vietnam , daumaytoaxe.com
8. ^ Vòng quanh các xí nghiệp đầu máy ở VN , Tour of railway factories in Vietnam , p.16 , daumaytoaxe.com
9. ^ Preserved Locomotives , www.railwaysofchina.com

Images

1. ^ 新闻资料：东方红型内燃机车 , Dongfang Hong (The east is red) types 2 and 3 museum images , news.workercn.cn
2. ^ 东方红2_DONGFANGHONG2 author:Dennis Wu, via www.flickr.com
3. ^ 新闻资料：东方红型内燃机车 , Dongfang Hong (The east is red) type 5 , museum images and technical details , news.workercn.cn
4. ^ DFH21 Images via www.flickr.com

External links

• ☆中国鉄道博物館　車両図録☆ Railway museum Beijing, diesel hydraulic gallery , www.geocities.jp