JNR Class D50

D50 319 in 1935

Type and origin
Power type	Steam
Designer	Tokichi Ogasawara
Builder	Kawasaki Heavy Industries Rolling Stock Company (204) Hitachi (80) Kisha Seizo (69) Nippon Sharyo (27)
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 ³⁄₄ 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 ¹⁄₂ in)
• Small tubes	57 mm (2 ¹⁄₄ in), 90 off
• Large tubes	140 mm (5 ¹⁄₂ 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 ⁷⁄₁₆ in × 26 in)

Performance figures
Maximum speed	70 km/h (43 mph)
Tractive effort	165.977 kN (37,313 lbf)

Career
Operators	Japanese Government Railways Japanese National Railways
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

Two D50s are preserved in Japan.^[1]

Wikimedia Commons has media related to D50 steam locomotives.

↑ 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.

Japanese Railway Locomotives

Steam locomotives	150 160 860 2120 3380 3900 5100 5500 7010 7100 7170 8150 8620 9600 B20 C10 C11 C12 C50 C51 C52 C53 C54 C55 C56 C57 C58 C59 C60 C61 C62 C63 D50 D51 D52 D60 D61 D62 E10

Diesel locomotives	DD11 DD13 DD14 DD15 DD16 DD17 DD18 DD19 DD20 DD50 DD51 DD53 DD54 DE10 DE11 DE15 DE50 DF50 DF200 HD300

Electric locomotives	EB10 ED10 ED18 ED60 ED61 ED62 ED70 ED71 ED72 ED73 ED74 ED75 ED76 ED77 ED78 ED79 EF15 EF30 EF50 EF51 EF52 EF53 EF55 EF56 EF57 EF58 EF59 EF60 EF61 EF62 EF63 EF64 EF65 EF66 EF67 EF70 EF71 EF80 EF81 EH10 ED500 EF200 EF210 EF500 EF510 EH200 EH500 EH800 Chichibu DeKi 100 Chichibu DeKi 200 Chichibu DeKi 300 Chichibu DeKi 500 Meitetsu DeKi 300 Meitetsu DeKi 400 Meitetsu DeKi 600 Meitetsu Class EL120 Seibu E31 Seibu E851 Toei E5000

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