JGR Class 7900

JGR Class 7900
JGR 183 (later 7900) at an unknown date
Technical specifications
Serial number(s)	6 – 9
Manufacturer(s)	JGR's Kobe Works
Build date	1896
Total produced	4
Classification	2-6-0
Dimensions	14,319 mm × 2,305 mm × 3,658 mm
Rail gauge	3 ft 6 in (1,067 mm)
Valve gear	Joy
Cylinders	2
Boiler pressure	10.2 kg/cm²
Fuel type	Coal
Heating area	90.2 m²
Service information
Years in-service	1896 – 1923
Running numbers	7900 – 7903 (originally 180 – 183, then 181 – 184)
Disposition details
Preserved	None
Number scrapped	4

The JGR Class 7900 (originally the JGR Class AK) was a 2-6-0 Mogul-type steam locomotive operated by the Japanese Government Railways from 1896 to 1923.

History

The Class 7900 was an early steam locomotive operated in Japan. The type was ordered by the JGR, with a total of four locomotives manufactured by the JGR's own Kobe Works in 1896. These were classified as the Class AK locomotives and numbered 180 through 183, but were later renumbered to 181 through 184 when 180 was unexpectedly used by a Class B3 locomotive. These were later renumbered to Class E5 with their numbers unchanged.

The locomotives were reclassified as the Class 7900 in 1909 when a formal rule regarding standardized classification of locomotives was enacted; the locomotives were thus renumbered 7900 through 7903. The locomotives were mainly used on the San'yō Main Line. The locomotives were all retired by 1923, with none sold to private railroads. No Class 7900s have been preserved.