JNR Class D50

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JGR-D50SteamLocomotive.jpg
D50 319 in 1935
Type and origin
Power type Steam
Designer Tokichi Ogasawara
Builder
Build date 1923–1931
Total produced 380
Specifications
Configuration 2-8-2
UIC class 1′D1′ h2
Gauge 1,067 mm (3 ft 6 in)
Driver dia. 1,400 mm (4 ft 7 in)
Length 17,248 mm (56 ft 7 in)
Height 3,955 mm (12 ft 11 34 in)
Axle load 14.70 tonnes (14.47 long tons; 16.20 short tons)
Loco weight 78.14 tonnes (76.91 long tons; 86.13 short tons)
Tender weight 49 tonnes (48 long tons; 54 short tons)
Firebox:
 • Firegrate area
3.25 m2 (35.0 sq ft)
Boiler:
 • Tube plates 5,500 millimetres (18 ft 12 in)
 • Small tubes 57 mm (2 14 in), 90 off
 • Large tubes 140 mm (5 12 in), 28 off
Boiler pressure 13.0 kg/cm2 (1.27 MPa; 185 psi)
Heating surface:
 • Tubes and flues
142.7 m2 (1,536 sq ft)
 • Firebox 13.5 m2 (145 sq ft)
Superheater:
 • Heating area 64.4 m2 (693 sq ft)
Cylinders Two, outside
Cylinder size 570 mm × 660 mm (22 716 in × 26 in)
Performance figures
Maximum speed 70 km/h (43 mph)
Tractive effort 165.977 kN (37,313 lbf)
Career
Operators
Class JGR: 9900 → D50
JNR: D50
Numbers 9900–9999, 19900–19999, 29900–29975 → D50 1 to D50 380
Retired 1965
Preserved D50 25, D50 140
Disposition Two preserved, remainder scrapped

The Class D50 is a type of 2-8-2 steam locomotive built by the Japanese Government Railways (JGR), the Japanese National Railways (JNR) and various manufacturers from 1923 to 1931. The class name indicates that the locomotive has four sets of driving wheels (D) and belongs to one of the classes of tender locomotive allocated a number in the series 50 to 99 in the Japan Railways locomotive numbering and classification scheme of 1928.

The design of the D50 was based on the JNR Class 9600 which was introduced in 1916. A total of 380 Class D50 locomotives were built.

Preserved examples[edit]

Two D50s are preserved in Japan.[1]

See also[edit]

References[edit]

  1. ^ Sasada, Masahiro (September 2012). 国鉄&JR保存車大全 [JNR & JR Preserved Rolling Stock Complete Guide]. Tokyo, Japan: Ikaros Publications Ltd. p. 133. ISBN 978-4863206175.