JNR Class DF50

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.[1]

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.[1][2] Production was shared between Kisha Seizō, Mitsubishi, and Nippon Sharyō.[2]

  • 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.[1][2] Production was shared between Hitachi, Kawasaki, and Toshiba.[2]

  • 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.[3] They operated on the following lines, including use hauling "Blue Train" sleeping car services.[2]

In later years, operations were restricted to Kyushu and Shikoku, with the remaining locomotives withdrawn in 1983, except for DF50 1, which later passed into JR Shikoku ownership.[1]

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.[2]

Preserved examples

Three Class DF50 locomotives were preserved.[3]

  • 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

Wikimedia Commons has media related to JNR DF50.
  1. ^ a b c d 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. ^ a b c d e f 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. ^ a b 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.

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