The is a five-axle

C-B Co-Bo or Co′Bo′ is a wheel arrangement in the UIC classification system for railway locomotives. It features two uncoupled bogies. The "Co" bogie has three driven axles and the "Bo" bogie has two. The arrangement has been used to even out ...

wheel arrangement In rail transport, a wheel arrangement or wheel configuration is a system of classifying the way in which wheels are distributed under a locomotive. Several notations exist to describe the wheel assemblies of a locomotive by type, position, and c ...

diesel-hydraulic A diesel locomotive is a type of railway locomotive in which the prime mover is a diesel engine. Several types of diesel locomotives have been developed, differing mainly in the means by which mechanical power is conveyed to the driving wheels ...

shunting locomotive A switcher, shunter, yard pilot, switch engine, yard goat, or shifter is a small railroad locomotive used for manoeuvring railroad cars inside a rail yard in a process known as ''switching'' (US) or ''shunting'' (UK). Switchers are not inten ...

type operated in Japan since 1968. A total of 116 locomotives were built between 1968 and 1979, and , 10 locomotives remain in service, operated by

East Japan Railway Company The is a major passenger railway company in Japan and is the largest of the seven Japan Railways Group companies. The company name is officially abbreviated as JR-EAST or JR East in English, and as in Japanese. The company's headquarters are ...

(JR East) and

Japan Freight Railway Company , or , is one of the seven constituent companies of Japan Railways Group (JR Group). It provides transportation of cargo nationwide throughout Japan. Its headquarters are in Shibuya, Tokyo near Shinjuku Station. The Japan Railways Group was foun ...

(JR Freight).

Variants

A total of 116 locomotives were built between 1968 and 1979, divided into the following sub-classes. * Class DE11-0: 65 locomotives built between 1968 and 1970 * Class DE11-1000: 46 locomotives built between 1970 and 1974 with uprated engines * Class DE11-1900: One locomotive built in 1975 with experimental noise-reduction features * Class DE11-2000: 4 locomotives built in 1979 with noise-reduction features

Design

The Class DE11 was developed from the

Class DE10 The is a class of Japanese C-B wheel arrangement diesel-hydraulic locomotives. 708 locomotives were built between 1966 and 1978. , 138 locomotives remained in operation. Variants DE10-0 subclass 158 DE10-0 locomotives were built with steam ...

locomotive design, with the train-heating steam generator and multiple-working equipment removed and replaced with concrete ballast weight to increase the

axle load An axle or axletree is a central shaft for a rotating wheel or gear. On wheeled vehicles, the axle may be fixed to the wheels, rotating with them, or fixed to the vehicle, with the wheels rotating around the axle. In the former case, bearing ...

from 13 t to 14 t to improve adhesion for use in shunting work.

History

DE11-0

65 locomotives were built between 1968 and 1970.

DE11-1000

46 locomotives were built between 1970 and 1974 with their engines uprated from to . Locomotives DE11 1030, 1032, 1035, and 1046 were fitted with "SLC" (Shunting Locomotive Control) equipment to allow remote control at Musashino Marshalling Yard in Saitama Prefecture. File:JRF-DE11 1029.jpg, JR Freight DE11 1029 in July 2013 File:DE11 1045 Shinagawa 20050228.jpg, JR East DE11 1045 in February 2005

DE11-1900

One locomotive, numbered DE11 1901, was built in 1975, experimentally incorporating a number of features to reduce external noise for use in yards close to residential areas. Features included additional sound-insulating around the engine compartment and a noise reduction unit on the exhaust chimney. DE11 1901 was withdrawn in 2000.

DE11-2000

Four Class DE11-2000 locomotives, numbered DE11 2001 to 2004 were built in 1979, incorporating some of the noise-reduction features tried out on DE11 1901. These locomotives also feature skirting to reduce noise. The locomotive length was increased from to . File:DE11 2001 (1 end) Zushi 20030422.JPG, JR Freight DE11 2001 in April 2003, still in original JNR livery File:DE11 2001.JPG, JR Freight DE11 2001 in JR Freight livery in April 2011 showing the noise-reduction skirting

Fleet status

By 1 April 1995, 14 locomotives were still in service, with ten (nine DE11-1000 and DE11 1901) operated by

(JR East) and four (DE11-2000) operated by

(JR Freight) , 10 locomotives remain in service, with three (DE11-1000) operated by JR East and seven (three DE11-1000 and four DE11-2000) operated by JR Freight.

Classification

The DE11 classification for this locomotive type is explained below. * D: Diesel locomotive * E: Five driving axles * 11: Locomotive with maximum speed of 85 km/h or less

References

{{Jreastloco Diesel locomotives of Japan DE11 DE11 C-B locomotives 1067 mm gauge locomotives of Japan Railway locomotives introduced in 1968 Kawasaki diesel locomotives Nippon Sharyo locomotives