KwangtungYueh-Han 4-8-2 Locomotives in China

Class Details by Steve Llanso of Sweat House Media

Class 201 (Locobase 15462)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 79, pp. 430+ . Works numbers were 60643-60644 in September 1928 and 60705-60706 in January 1929.

This designed used the boiler and firebox design of the Sorocabana three-cylinder Mountains delivered in 1924 and described in Locobase 15270. Its firebox heating surface area included 19 sq ft (1.75 sq m) of arch tubes. Each cylinder's 8" (203 mm) piston valve was actuated by its own valve gear.

Several years of service prompted a letter from C A Campbell dated 26 September 1933: "The Railway have [sic] had trouble due to breakage of the shop bolts and the big end of the main rod for the center cylinder. They have replaced the botls with ones made of nickel steel and on further trouble has been experienced since this change was made. The oil space on top of the driving boxes is insufficient and mechanical lubricants are being applied."

Most three-cylinder setups suffered from similar difficulties with maintaining that center cylinder.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID15462
Number in Class4
Road Numbers201-204
Number Built4
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)13.25 / 4.04
Engine Wheelbase (ft / m)30.83 / 9.40
Ratio of driving wheelbase to overall engine wheelbase 0.43
Overall Wheelbase (engine & tender) (ft / m)59.27 / 18.07
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)122,000 / 55,338
Engine Weight (lbs / kg)180,000 / 81,647
Tender Loaded Weight (lbs / kg)128,000 / 58,060
Total Engine and Tender Weight (lbs / kg)308,000 / 139,707
Tender Water Capacity (gals / ML)6300 / 23.86
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 9.90 / 9
Minimum weight of rail (calculated) (lb/yd / kg/m)51 / 25.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)50 / 1270
Boiler Pressure (psi / kPa)195 / 13.40
High Pressure Cylinders (dia x stroke) (in / mm)17" x 24" / 432x610 (3)
Tractive Effort (lbs / kg)34,489 / 15643.97
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.54
Heating Ability
Tubes (number - dia) (in / mm)160 - 2" / 51
Flues (number - dia) (in / mm)27 - 5.375" / 137
Flue/Tube length (ft / m)19 / 5.79
Firebox Area (sq ft / m2)181 / 16.82
Grate Area (sq ft / m2)44.30 / 4.12
Evaporative Heating Surface (sq ft / m2)2485 / 230.86
Superheating Surface (sq ft / m2)584 / 54.25
Combined Heating Surface (sq ft / m2)3069 / 285.11
Evaporative Heating Surface/Cylinder Volume262.75
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation8639
Same as above plus superheater percentage10,280
Same as above but substitute firebox area for grate area42,001
Power L114,856
Power MT1073.83

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