Oahu Sugar Company 0-6-2 Locomotives of the USA


Class Details by Steve Llanso of Sweat House Media

Class Hoaeae (Locobase 12408)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 23, p 4. For more information on the Oahu Sugar Company, see the Hawaiian Sugar Planters Association's Plantation Archives online at http://www2.hawaii.edu/~speccoll/p_oahu.html . Works numbers were 17911 in July 1900, 18022 in August.

Locobase doesn't know enough Hawaiian history to comment on the significance of changing the name of the first locomotive from Hoaeae to Waikele soon after its arrival on Oahu. Waiawa didn't undergo a similar change.

Both plantation radial tank rode on the OSC's 30 lb/yard (15 kg/metre) rail, climbed the 2 1/2% to 3% grades, and worked around curves as tight as 20-25 degrees.

See Locobase 13455 to later engines equipped for oil burning.


Class Waikakalaua (Locobase 13455)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 32, p. 237 and Vol 54, pp. 421+ . Works numbers were 32816 in July 1908 and 44661 in December 1916.

Locobase 12408 describes the first two locomotives of this arrangement to work on the Oahu Sugar's plantation lines.

Eight years after they were delivered, the company added the Waikakalaua; the one change was conversion to oil firing fueled by 250 gallons in a rear bunker and an increase in tank capacity to 850 gallons. 46 years later, this engine would be sold to the Railway & Locomotive Historical Society, which would display it in Los Angeles' Travel Town.

After another 8 years, the Oahu Sugar Company completed its quartet of radial tanks with Koalipea. This engine repeated the Waikakalua's dimensions and fuel method, but had greater water capacity of 880 US gallons (3,331 litres). Its adhesion weight rose to 47,000 lb (21,319 kg) and engine weight increased to 55,000 lb (24,948 kg).

Specifications by Steve Llanso of Sweat House Media
ClassHoaeaeWaikakalaua
Locobase ID12408 13455
RailroadOahu Sugar CompanyOahu Sugar Company
CountryUSAUSA
Whyte0-6-2ST0-6-2ST
Number in Class42
Road Numbers3-65-6
Gauge3'3'
Number Built42
BuilderBurnham, Williams & CoBurnham, Williams & Co
Year19001908
Valve GearStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase7'7'
Engine Wheelbase13.25'13.25'
Ratio of driving wheelbase to overall engine wheebase 0.53 0.53
Overall Wheelbase (engine & tender)13.25'13.25'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers44000 lbs45000 lbs
Engine Weight51000 lbs51000 lbs
Tender Light Weight
Total Engine and Tender Weight51000 lbs51000 lbs
Tender Water Capacity550 gals650 gals
Tender Fuel Capacity (oil/coal)250 gals
Minimum weight of rail (calculated)24 lb/yard25 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter33"33"
Boiler Pressure160 psi160 psi
Cylinders (dia x stroke)12" x 16"12" x 16"
Tractive Effort9495 lbs9495 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.63 4.74
Heating Ability
Firebox Area39.50 sq. ft39.50 sq. ft
Grate Area 8.80 sq. ft 8.80 sq. ft
Evaporative Heating Surface450 sq. ft450 sq. ft
Superheating Surface
Combined Heating Surface450 sq. ft450 sq. ft
Evaporative Heating Surface/Cylinder Volume214.86214.86
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation14081408
Same as above plus superheater percentage14081408
Same as above but substitute firebox area for grate area63206320
Power L127212721
Power MT409.01399.92


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