JNR Class DE11

The Class DE11 (DE11形) is a five-axle C-B wheel arrangement diesel-hydraulic shunting locomotive 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 (JR East) and Japan Freight Railway Company (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 locomotive design, with the train-heating steam generator and multiple-working equipment removed and replaced with concrete ballast weight to increase the axle load from 13 t to 14 t to improve adhesion for use in shunting work.

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 1250 hp to 1350 hp.

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.

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DE11 1901 was withdrawn in 2000.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 14,150 mm to 16,650 mm.

Fleet status
By 1 April 1995, 14 locomotives were still in service, with ten (nine DE11-1000 and DE11 1901) operated by East Japan Railway Company (JR East) and four (DE11-2000) operated by Japan Freight Railway Company (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