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

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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 ID12,408 13,455
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 Wheelbase (ft / m)7 / 2.137 / 2.13
Engine Wheelbase (ft / m)13.25 / 4.0413.25 / 4.04
Ratio of driving wheelbase to overall engine wheebase 0.53 0.53
Overall Wheelbase (engine & tender) (ft / m)13.25 / 4.0413.25 / 4.04
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)44,000 / 19,95845,000 / 20,412
Engine Weight (lbs / kg)51,000 / 23,13351,000 / 23,133
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)51,00051,000
Tender Water Capacity (gals / ML)550 / 2.08650 / 2.46
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)250 / 0.90
Minimum weight of rail (calculated) (lb/yd / kg/m)24 / 1225 / 12.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)33 / 83833 / 838
Boiler Pressure (psi / kPa)160 / 11160 / 11
High Pressure Cylinders (dia x stroke) (in / mm)12" x 16" / 305x40612" x 16" / 305x406
Tractive Effort (lbs / kg)9495 / 4306.869495 / 4306.86
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.63 4.74
Heating Ability
Firebox Area (sq ft / m2)39.50 / 3.6739.50 / 3.67
Grate Area (sq ft / m2) 8.80 / 0.82 8.80 / 0.82
Evaporative Heating Surface (sq ft / m2)450 / 41.82450 / 41.81
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)450 / 41.82450 / 41.81
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