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JNR Class DF50

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Japanese diesel locomotive type

Class DF50
A pair of DF50s on a farewell tour in 1983
Type and origin
Power typeDiesel–electric
Builder
Build date1957–1963
Total produced138
Specifications
Configuration:
​
 • UICBo'Bo'Bo'
 • CommonwealthBo-Bo-Bo
Gauge1,067 mm (3 ft 6 in)
Wheel diameter800 mm (2 ft 7 in)
Length16,400 mm (53 ft 10 in)
Width2,932 mm (9 ft 7.4 in)
Height3,987 mm (13 ft 1.0 in)
Loco weight85.1 t
Traction motorsMT48 x 6
Performance figures
Maximum speed90 km/h (55 mph)
Power output1,060 hp (DF50-0), 1,200 hp (DF50-500)
Career
First run1957
Last run1983
Preserved3

The Class DF50 (DF50形) is a class of Bo-Bo-Bo wheel arrangement diesel–electric locomotives operated by Japanese National Railways (JNR) in Japan from 1957 until 1983.

Variants

DF50-0

The first batch of 65 locomotives was built between 1957 and 1962 with Sulzer 8-cylinder 8LDA25A 1,060 hp diesel engines. Production was shared between Kisha Seizō, Mitsubishi, and Nippon Sharyō.

  • DF50 1 on a passenger service in 1979 DF50 1 on a passenger service in 1979
  • DF50 65 on a freight working in 1982 DF50 65 on a freight working in 1982

DF50-500

A later batch of 73 locomotives was built between 1958 and 1963 with MAN V6 V22/30 1,200 hp diesel engines. Production was shared between Hitachi, Kawasaki, and Toshiba.

  • DF50 573 on a passenger service in Shikoku in 1979 DF50 573 on a passenger service in Shikoku in 1979

Operations

A pair of Class DF50s on a limestone freight working in 1983

Class DF50 locomotives were intended for use on both passenger and freight services, and included a steam generator for train heating. They operated on the following lines, including use hauling "Blue Train" sleeping car services.

In later years, operations were restricted to Kyushu and Shikoku, with the remaining locomotives withdrawn in 1983, except for DF50 1, which later passed into JR Shikoku ownership.

Livery

The locomotives were initially painted in all-over maroon with stainless steel bands, but were subsequently repainted into the standard JNR diesel locomotive livery of vermillion and grey.

Preserved examples

Three Class DF50 locomotives were preserved.

  • Preserved DF50 1 at The Railway History Park in Saijo in May 2015 Preserved DF50 1 at The Railway History Park in Saijo in May 2015
  • Preserved DF50 18 at the Tsuyama Railroad Educational Museum in May 2016 Preserved DF50 18 at the Tsuyama Railroad Educational Museum in May 2016

Classification

Main article: Japan Railways locomotive numbering and classification

The DF50 classification for this locomotive type is explained below.

  • D: Diesel locomotive
  • F: Six driving axles
  • 50: Locomotive with maximum speed exceeding 85 km/h

References

  1. ^ JR全車輛ハンドブック1995 [JR Rolling Stock Handbook 1995] (in Japanese). Japan: Neko Publishing. 1995. p. 71.
  2. ^ Inoue, Kōichi (1999). 国鉄機関車事典: 蒸気・電気・ディーゼル機関車66形式 国鉄機関車辞典 [JNR Locomotive Encyclopedia] (in Japanese). Japan: Sankaido. pp. 182–183. ISBN 978-4-381-10338-3.
  3. ^ Sasada, Masahiro (September 2012). 国鉄&JR保存車大全 [JNR & JR Preserved Rolling Stock Complete Guide] (in Japanese). Tokyo, Japan: Ikaros Publications Ltd. pp. 34, 127. ISBN 978-4863206175.
  4. DF50 18が津山に向けて陸送される [DF50 18 moved to Tsuyama]. RM News (in Japanese). Japan: Neko Publishing Co., Ltd. 11 March 2015. Archived from the original on 5 August 2018. Retrieved 11 March 2015.
Japanese National Railway Diesel Locomotives
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