The China Railways DFH1 was a type of 4-axle B'B' single-cab diesel-hydraulic locomotive used on mainline passenger services; the DFH3 was a later development of a similar design but with two driving cabs.

Quick Facts DFH1, DFH3, DFH4 东方红1、东方红3、东方红4, Type and origin ...

DFH1, DFH3, DFH4 东方红1、东方红3、东方红4
DFH3 0009 at Beijing Railway Museum (2010)
Type and origin Power type Diesel-hydraulic Builder DFH1: Sifang DFH3: Sifang DFH4 Sifang, Ziyang, Qishuyan  China Build date DFH1 1959‡[1] 1964-1972 (series) DFH3 1976-87[1] DFH4 1969-81[2] Total produced DFH1 109[1] DFH3 268 DFH4 6[2]
Specifications Configuration: ​  • UIC DFH1,DFH3 B’B’ DFH4 6 axle Gauge 1,435 mm (4 ft 8+1⁄2 in) Wheel diameter DF1, DF3 1,050 mm (41.34 in) DF4 ? Minimum curve DF1, DF3 145 m (476 ft) DF4 ? Length DFH1 16.550 m (54 ft 3.6 in)[1] DFH3 17.970 m (58 ft 11.5 in)[1] Width DFH1 3.106 m (10 ft 2.28 in) DFH3 3.279 m (10 ft 9.09 in) Height DFH1 4.516 m (14 ft 9.80 in) DFH3 4.450 m (14 ft 7.20 in) Loco weight DFH1 84 t (83 long tons; 93 short tons) DFH3 92t Prime mover DFH1 2 of 12V175Z, 12V180Z or 12V175ZL DFH3 12V180JZ DFH4 2 of 12V200ZL later 12V200ZJ[2] Transmission DFH1 hydraulic 12175Z (2 of)[3]
Performance figures Maximum speed DFH1 140 km/h (87 mph)*,[1] 120 km/h (75 mph)†[1] DFH3 120 km/h (75 mph)[1] Power output DFH1 1,060 kW (1,420 hp)*,[1] 1,220 kW (1,640 hp)†[1] DFH3 2*730 kW (980 hp), 2*820 kW (1,100 hp)¤[1] DFH4 3,308 kW (4,436 hp)¶[1] Tractive effort DFH1250 kN (56,000 lbf) / 270 kN (61,000 lbf) (maximum) DFH3 271 kN (61,000 lbf) (maximum)
Career Operators China Railway Korean State Railway
First 73 units † Final 36 units ‡ NY1 prototype ¤ Two units produced in 1986 of higher power ¶ First units produced were of higher power[2]

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The China Railways DFH4 was a 6-axle high-powered freight and passenger locomotive, it did not reach mass production.

The first prototype unit (NY1) (neiran yeli chuandong meaning diesel-hydraulic transmission)^[4] was produced in 1959 at Sifang locomotive works, and given the name 'Weixing'. Locomotive design was similar to German diesel-hydraulic machines such as the DB Class V 200 - the machine had a pair of high-speed diesel engines, each driving a separate hydraulic torque converter based transmission resulting in low mass compared to contemporary diesel-electric machines.

Series production began in 1964. The locomotive was used for passenger trains.^[1] The locomotives could be worked in multiple, and were often used in this way, with a cab at each end. They operated on the Beijing Shenyang passenger trains.^[5]

The DFH3 shares the same twin engine and twin hydraulic transmission as the DFH1 but is a two-cab design.

The production of the DFH3 follows on from the DFH1. The class were used on passenger trains in northeast China, by 2010 most had been displaced, and some are believed to being used in industrial service.^[6]

The Qishuyan Ziyang Diesel locomotive works manufactured six locomotives of type DFH4 between 1969 and 1981. The first unit was produced in 1969 with an overall 5,000 hp (3,700 kW) machine with twin engine and hydraulic transmission.^[1] Two 4,500 hp (3,400 kW) machines were produced in 1971 and 1974. Between 1975 and 1981 the Ziyang plant investigated the manufacture of further locomotives using the 12V200ZJ engine.^[2]

• China Railways DFH shunting locomotives, Contemporary Chinese diesel-hydraulic locomotives used primarily for shunting

One unit, locomotive number DFH1 4290 is an exhibit at the Beijing China Railway Museum, all other units have been destroyed^[9] except DFH1 4222 which is believed to be at the locomotive museum in Shenyang.^[10] The Beijing museum also stores DFH3 0009.^[10]