Nan Hsun 2-6-2 Locomotives in China

Class Details by Steve Llanso of Sweat House Media

Class 10 (Locobase 14630)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Vol 60, pp. 168. See also Julean Arnold, Commercial Handbook of China, Volume I, Miscellaneous Series-No 84 (Washington, DC: Government Printing Office, 1919). p. 153. Works numbers were 41862 in January 1915. Ordered by Arnhold, Karberg & Company.

At first glimpse, the Nan Hsun Railway doesn't offer that much of a challenge to this Prairie tank. Curves on the main line had an easy 1,000 foot (304.8 m) radius (5 3/4 degrees) and the maximum grade came to only 1%. But obstacles there were--at one point the 1% ascent went on for five miles (8 km), for example. And how to boil the water? The fuel was described as "poor bituminous coal". Then the reader can picture the agent saying to himself, "Let's give the real story" because those three words are followed by "Most of fuel is powder dampened with water." The firebox and grate seem awfully small to get much out of that.

Along a final distance of 87 miles (140 km) between Kiukiang and Nanchangfu, the line was constructed by Japanese engineers (who knew a thing or two about bad coal, one imagines). The first 20 miles (32 km) were opened in 1910 and the rest in 1915. Water stops were positioned about 30 miles (48 km) apart.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID14630
RailroadNan Hsun
Number in Class1
Road Numbers10
Number Built1
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 8.33 / 2.54
Engine Wheelbase (ft / m)22.50 / 6.86
Ratio of driving wheelbase to overall engine wheelbase 0.37
Overall Wheelbase (engine & tender) (ft / m)22.50 / 6.86
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)88,000 / 39,916
Engine Weight (lbs / kg)121,000 / 54,885
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)121,000 / 54,885
Tender Water Capacity (gals / ML)1500 / 5.68
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)3 / 3
Minimum weight of rail (calculated) (lb/yd / kg/m)49 / 24.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)46 / 1168
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)17" x 22" / 432x559
Tractive Effort (lbs / kg)21,147 / 9592.13
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.16
Heating Ability
Tubes (number - dia) (in / mm)200 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)10.21 / 3.11
Firebox Area (sq ft / m2)91.70 / 8.52
Grate Area (sq ft / m2)14.38 / 1.34
Evaporative Heating Surface (sq ft / m2)1154 / 107.21
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1154 / 107.21
Evaporative Heating Surface/Cylinder Volume199.67
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2588
Same as above plus superheater percentage2588
Same as above but substitute firebox area for grate area16,506
Power L13850
Power MT289.36

All material Copyright ©
Wes Barris