JGR Class 3150

JGR Class 3150
523 (later 3152) at an unknown date
Technical specifications
Serial number(s)	22 – 25
Manufacturer(s)	JGR's Kobe Works
Build date	1904
Total produced	4
Classification	2-6-2T
Dimensions	10,699 mm × 2,460 mm × 3,658 mm
Rail gauge	3 ft 6 in (1,067 mm)
Valve gear	Joy
Cylinders	2
Boiler pressure	10.5 kg/cm²
Fuel type	Coal
Heating area	96.7 m²
Service information
Years in-service	1904 – 1922
Running numbers	3150 – 3153 (originally 521 – 524)
Disposition details
Preserved	None
Number scrapped	4

The JGR Class 3150 (originally the JGR Class B7) was a 2-6-2T Prairie-type side tank steam locomotive operated by the Japanese Government Railways from 1904 to 1922.

History

The Class 3150 was an early steam locomotive operated in Japan. The type was designed by Richard Francis Trevithick (grandson of Richard Trevithick) and manufactured at JGR's own Kobe Works; Trevithick was an inspector at JGR at the time. Four locomotives were manufactured by 1904. The locomotives were essentially a locally-produced copy of the Class B5 locomotives also in use on the JGR at the time but featured modifications overseen by Trevithick such as Joy valve gear as opposed to Stephenson.

The locomotives were reclassified the Class 3150 and renumbered 3150 through 3153 after the establishment of a rule to standardize locomotive naming in 1909. The locomotives were retired in 1922, with none sold to private railroads. No Class 3150s have been preserved.