JNR Class DD51

Specifications
Specifications
Configuration:;
• UIC	B-2-B
Gauge	1,067 mm (3 ft 6 in)
Wheel diameter	860 mm (34 in)
Length	18,000 mm (59 ft 1 in)
Width	2,951–2,971 mm; (9 ft 8.2 in – 9 ft 9.0 in)
Height	3,956 mm (12 ft 11.7 in)
Loco weight	84 t (83 long tons; 93 short tons)
Transmission	Hydraulic

Type and origin
Type and origin
Power type	Diesel-hydraulic
Builder	Hitachi, Kawasaki, Mitsubishi
Build date	1962–1978
Total produced	649

Class DD51
Class DD51
	DD51 1027 in October 2007
Power type
Type and origin
Power type	Diesel-hydraulic
Builder	Hitachi, Kawasaki, Mitsubishi
Build date	1962–1978
Total produced	649
Configuration:;
Specifications
Configuration:;
• UIC	B-2-B
Gauge	1,067 mm (3 ft 6 in)
Wheel diameter	860 mm (34 in)
Length	18,000 mm (59 ft 1 in)
Width	2,951–2,971 mm; (9 ft 8.2 in – 9 ft 9.0 in)
Height	3,956 mm (12 ft 11.7 in)
Loco weight	84 t (83 long tons; 93 short tons)
Transmission	Hydraulic
Maximum speed
Performance figures
Maximum speed	95 km/h (60 mph)
Power output	2,200 hp (1,600 kW)
Operators
Career
Operators	JNR, JR Hokkaido, JR East, JR Central, JR West, JR Freight
Number in class	29 (as of 1 April 2016)
Disposition	Operational

The Class DD51 (DD51形) is a B-2-B wheel arrangement diesel-hydraulic locomotive type operated in Japan since 1962. 649 locomotives were built between 1962 and 1978 by Kawasaki Sharyo, Hitachi, and Mitsubishi. The class was designed for mainline passenger and freight use with more power than the D51 and a higher maximum speed than the C62 steam locomotive classes. This was achieved by installing two 1,100 hp engines in an 18 metre long centre-cab design, unusual for mainline operation. The V12 DML61 engines were developed from the 6-cylinder inline DMF31 engines used in the Class DD13 locomotives. As of 1 April 2016, 29 locomotives remained in operation.

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