JNR Class DE11

"DE11" redirects here. For the highway in Delaware, see Delaware Route 11.

The Class DE11 (DE11形) is a five-axle C-B wheel arrangement diesel-hydraulic switcher locomotive type operated in Japan since 1968. A total of 116 locomotives were built between 1968 and 1979, and as of 1 April 2016^[update], 10 locomotives remain in service, operated by East Japan Railway Company (JR East) and Japan Freight Railway Company (JR Freight).

Class DE11
JR Freight DE11 2001 in January 2011
Type and origin Power type Diesel-hydraulic Builder Kawasaki Heavy Industries, Nippon Sharyo Build date 1968–1979 Total produced 116
Specifications Configuration: ​  • UIC C-B Gauge 1,067 mm (3 ft 6 in) Length 14,150 mm (46 ft 5 in) (DE11-0/1000) 16,650 mm (54 ft 8 in) (DE11-2000) Width 2,950 mm (9 ft 8 in) Height 3,965 mm (13 ft 0.1 in) Axle load 14 t (13.8 long tons; 15.4 short tons) Loco weight 70 t (68.9 long tons; 77.2 short tons) Fuel type Diesel Fuel capacity 2,500 L (660 US gal) Engine type DML61ZB Transmission Hydraulic MU working N/A
Performance figures Maximum speed 85 km/h (55 mph) Power output 1,250 hp (930 kW) (DE11-0) 1,350 hp (1,010 kW) (DE11-1000/2000) Tractive effort 21,000 kgf (210,000 N; 46,000 lbf)
Career Operators ■ JNR (1968-1987) ■ JR Freight (1987-) ■ JR East (1987-) Number in class 10 (as of 1 April 2016[update]) Disposition In service

Variants

A total of 116 locomotives were built between 1968 and 1979, divided into the following sub-classes.^[1]

• 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.^[1]

History

DE11-0

JNR DE11 11 in August 1985

65 locomotives were built between 1968 and 1970.^[2]

DE11-1000

46 locomotives were built between 1970 and 1974 with their engines uprated from 1,250 hp (930 kW) to 1,350 hp (1,010 kW).^[2]

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.^[2]

• 
  JR Freight DE11 1029 in July 2013
• 
  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.^[1] Features included additional sound-insulating around the engine compartment and a noise reduction unit on the exhaust chimney.^[1]

DE11 1901 was withdrawn in 2000.^[1]

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.^[2] The locomotive length was increased from 14,150 mm (46 ft 5 in) to 16,650 mm (54 ft 8 in).^[2]

• 
  JR Freight DE11 2001 in April 2003, still in original JNR livery
• 
  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 East Japan Railway Company (JR East) and four (DE11-2000) operated by Japan Freight Railway Company (JR Freight)^[3]

As of 1 April 2016^[update], 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.^[4]

Classification

Main article: Japan Railways locomotive numbering and 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