Maui Agricultural Company 2-6-0 "Mogul" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class Maui (Locobase 10987)

Data from Record of Recent Construction #54 (Baldwin Locomotive Works, 1905), p. 28-29 and DeGolyer, Volume 27, p. 166. Works numbers were 24881 in December 1904, 29801 in December 1906, and 33592 in July 1909.

It's surprising to find a straight-up stack on an engine so clearly intended to haul sugar cane, but this trio was fueled by oil and not cane dross. Keakua's firebox description shows that although delivered as an oil burner and paved with firebrick, its design was also to enable it to burn coal or wood, "so change of fuel can be readily made." Baldwin delivered two grates, the wood-burner with plain bars and drop plates and a coal-burner with rocking bars and drop plates. Two ash pans, one for oil and the other for coal or wood, also accompanied the engine. Also, the engine had two stacks--an oil-burner's straight pipe and the Radley & Hunter diamond stack for coal or wood.

The Maui's operating environment included 3% grades and work areas that required the engine to "run as much backwards as forwards."The rear driving axle was placed ahead of the firebox; Locobase wonders if that complicated backward running or aided it by placing the firebox so low in the frame. The engine also faced the usual tough track and had springs made one plate heavier than usual.

Maui was joined two years later by Haiku. Keakua followed almost three years after that. (Clearly these purchases were not made lightly.) Once on the island, however, they were run for decades under the MAC herald and, after 1948, on the motive-power roster of the successor Hawaiian Commercial Sugar.

Class Pulehu (Locobase 14530)

Data from See also DeGolyer, Vol 34, pp. 423+. Works numbers were 44599 in December 1916.

This plantation Mogul joined its fellow Baldwins on the MAC more than a decade after their delivery (Locobase 10987). It was a bit bigger and more powerful than the earlier engines. Even though the Pulehu was an oil-burner, it was still fitted with the spark-arresting Radley & Hunter diamond stack.

Like the others, Pulehu would run backward as much as forward, according to the specs, scaling 4% grades and getting around curves with radii as small as 200 feet (61 metres).

Notes in the Pulehu's specifications hint at a shortcoming in the 1904 locomotives: "Special attention to be paid to staying of crown sheet both in design and workmanship to avoid the possibility of sheet dropping." Perhaps the extra care was the reason for this engine's long life. In 1948, it was sold to Hawaiian Comercial & Sugar.

Specifications by Steve Llanso of Sweat House Media
Locobase ID10,987 14,530
RailroadMaui Agricultural CompanyMaui Agricultural Company
Number in Class31
Road Numbers2-45
Number Built31
BuilderBurnham, Williams & CoBaldwin
Valve GearStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft) 7.25 7.25
Engine Wheelbase (ft)13.6713.92
Ratio of driving wheelbase to overall engine wheebase 0.53 0.52
Overall Wheelbase (engine & tender) (ft)36.4238.81
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)44,42048,000
Engine Weight (lbs)52,72056,000
Tender Loaded Weight (lbs)21,28044,000
Total Engine and Tender Weight (lbs)74,000100,000
Tender Water Capacity (gals)12002200
Tender Fuel Capacity (oil/coal) (gals/tons)600900
Minimum weight of rail (calculated) (lb/yd)2527
Geometry Relating to Tractive Effort
Driver Diameter (in)3737
Boiler Pressure (psi)150150
High Pressure Cylinders (dia x stroke) (in)13" x 18"14" x 18"
Tractive Effort (lbs)10,48312,157
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.24 3.95
Heating Ability
Firebox Area (sq ft)40.8052.20
Grate Area (sq ft)911
Evaporative Heating Surface (sq ft)627725
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)627725
Evaporative Heating Surface/Cylinder Volume226.74226.06
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation13501650
Same as above plus superheater percentage13501650
Same as above but substitute firebox area for grate area61207830
Power L127802844
Power MT413.92391.87

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