JNR Class D50
D50 319 in 1935
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| 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 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 | |
| Class | JGR: 9900 → D50 JNR: D50 CCR: D50 CR: ㄇㄎ16 |
| 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.
In 1939, D50 193 was converted to standard gauge and shipped to the Central China Railway, where it operated primarily between Nanjing and Shanghai. After the establishment of the People's Republic of China, it was taken over by the China Railway, where it was classified ㄇㄎ16 (MK16) in 1951, but it was off the roster by 1955.
Two D50s are preserved in Japan.
D50 25 in Kitami, Hokkaido
D50 140 at Umekoji Steam Locomotive Museum
...
Wikipedia