JNR Class DD51

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DD51
JNR DD51 1027 20071003.jpg
DD51 1027
Type and origin
Power type Diesel-hydraulic
Builder Hitachi, Kawasaki, Mitsubishi
Build date 1962 - 1978
Specifications
UIC class B-2-B
Gauge 1,067 mm (3 ft 6 in)
Wheel diameter 860 mm
Length 18,000 mm
Width 2,951 mm - 2,971 mm[1]
Height 3,956 mm
Loco weight 84 tonnes
Transmission Hydraulic
Performance figures
Maximum speed 95 kilometres per hour (60 mph)
Power output 2,200 hp
Career
Operators JNR, JR Hokkaido, JR East, JR Central, JR West, JR Freight
Number in class 649[1]
Disposition Operational

The DD51 is a class of Japanese B-2-B wheel arrangement diesel-hydraulic locomotives. 649 locomotives were built between 1962 and 1978 by Kawasaki Sharyō, 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 DD13 locomotives.[2]

Variations

Locos numbered from DD51 501 to 799 and from 1001 to 1186 were equipped to operate in multiple, and locos numbered DD51 800 to 899 and 1801 to 1805 were built without steam generators for train heating.[2]

Liveries

All locomotives numbered from DD51 2 onwards were finished in the standard diesel livery of orange/red with grey upper surfaces separated by a white stripe. Re-engined locos operated by JR Freight in Hokkaidō sport a livery based on the DF200 colour scheme, with no white stripe. These locomotives are frequently used in pairs double-heading freight trains.

JR Hokkaidō locos are all finished in the "Hokutosei" livery of blue with a gold stripe and shooting star logo. These are used in pairs for hauling sleeper trains (Hokutosei, Cassiopeia, and Twilight Express) between Hakodate and Sapporo.[3]

DD51 592 (now withdrawn), and now DD51 791, was repainted in the "Euroliner" livery of pale blue with dark blue stripes for use with JR Central's "Euroliner" Joyful Train set.

DD51 842 was designated as the Imperial Train locomotive. Whereas regular members of the class have white handrails and edges to the running boards, they are polished stainless steel on this particular locomotive, as are the exhaust shrouds. Based at Takasaki Depot, it is also used for special excursion trains.[3]

  • DD51 842 on an Imperial Train working, October 2001

  • DD51 1095 in JR Hokkaido Hokutosei livery, February 2010

  • JR Central DD51 791 in Euro Liner livery

  • DD51 1166 in JR Freight blue livery initially applied to refurbished locomotives, July 2006

  • DD51 1803 in JR Freight red livery applied to refurbished locomotives, August 2007

Refurbishment

Hokkaido-based JR Freight DD51 1152

As of April 2003, there were 138 DD51s still in service, with the vast majority operated by JR Freight. Of these, many have recently undergone life extension refurbishment, which includes removal of steam generator equipment where still fitted. These locos are distinguished by a new livery of blue with grey upper surfaces separated by a white stripe, and cream end panels.

DD51 class locomotives also formed the basis for the DD17, DD18, and DD19 self-propelled snow plough units.[3]

Fleet allocation

As of 1 April 2009 the DD51 fleet was as follows.[4]

Preserved examples

The prototype, DD51 1, with its unique, more rounded appearance, was moved to the Usui Pass Railway Heritage Park in April 1998 and repainted in its original livery of brown with white lining. This locomotive was withdrawn March 1986, and was subsequently stored at Takasaki Depot from March 1987.[1]

  • Prototype DD51 1 preserved at the Usui Pass Railway Heritage Park, April 2011

  • DD51 849 at the Railway Technical Research Institute (RTRI) facility in Kokubunji, Tokyo, October 2001

See also

References

  • "Tetsudō Zukan" (Railway Picture Book) JR & JNR Edition, Ikaros Publishing 1998

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  4. ↑ Japan Railfan Magazine: July 2009 issue
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