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).[img 1]
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.[img 2]
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.
Four units produced for shunting in mines and industrial environments.
Locomotives similar in design to the DFH2 type but built to meter gauge and used as universal locomotives. The locomotives were used on the Kunming metre gauge railway, including passenger services.[img 3]
As of 2012, Kunming rail fans report that DFH21 locos are still used to haul a few passenger trains a day along the metre gauge tracks from Kunming North Railway Station to several nearby stations. In 2014 they still drive these trains. 
30 of the locomotives are also used by Vietnam Railways where they are known as the D10H, in 2005 the Vietnam railways had 20 units operational. In 2009 ten of the engines had Caterpillar Inc. 3512B engines fitted as replacements.
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