JNR Class DE11

Width2,950 mm (9 ft 8 in)Height3,965 mm (13 ft 0.1 in)Axle load14 tLoco weight70 tFuel typeDieselFuel capacity2,500 lEngine typeDML61ZBTransmissionHydraulicMU workingN/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

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 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).

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

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DE11 1901 was withdrawn in 2000.^[1]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

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