Kahului Railroad 2-6-2 "Prairie" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 10 (Locobase 4417)

Data from narrowmind.railfan.net and DeGolyer, Vol 72, pp. 248+, Vol 78, pp. 360+, and Vol 79, pp. 361+ Works numbers were 58009 in September 1924, 60486 in May 1928, and 60690 in December.

Prairies a little larger than the 1915-era #9 (Locobase 14256), these had more, but smaller-diameter tubes.

All of them served the Maui port of Kahului, transporting construction materials inland and pineapples and sugar cane portward. Relatively large oil-burners with straight stacks; the fuel's properties were described as Standard Oil, gravity of 18-19 degrees with a minimum of 14 degrees.

A transportation sales website -- http://www.trains-trams-trolleys.com/equipment/small/3017/ (visited 30 Dec 2002) tells us that 12 operated for almost 40 years and is said to have been the last steam locomotive operated commercially in Hawaii (in 1966).

After its retirement, the 12 was sold to John Houghton of San Leandro, Calif, who in turn sold it to Chamas, NM-based Scenic Railways. In 1982, the engine was sold again to Midwest Central Railroad, a 1 1/4-mile circle aroung McMillan Park in Mt Pleasant, Iowa. Purchased later by the Silverwood Theme Park in Athol, Idaho and rebuilt in 1988, the locomotive was available for sale in 2002 for $250,000.

12 ultimately wound up on the Georgetown Loop Railroad in Colorado and was rebuilt again to come into compliance with FRA regulations in 2008.

Additional information tells us that stamps issued by thhe Kahului are a collector's item. Many websites talk about the various stamp issues, examples of the only stamps to have been issued by a railroad.

Class 9 (Locobase 14256)

Data from DeGolyer, Vol 54, pp. 427+. Works number was 41925 in February 1915.

Baldwin's main contribution to this Maui-island common carrier was this mixed-traffic Mogul. The KRR was a subsidiary of "Big Five" sugar company Alexander & Baldwin and used the 9 to move construction materials in from the harbor and processed cane out. The 9 also helped moved quarried rock to the artificial harbor at Kahului then under construction.

Like the later 2-6-2s shown in Locobase 4417, this engine was retired in 1950.

Specifications by Steve Llanso of Sweat House Media
Locobase ID4417 14256
RailroadKahului RailroadKahului Railroad
Number in Class31
Road Numbers10-129
Number Built31
Valve GearWalschaertWalschaert
Locomotive Length and Weight
Driver Wheelbase8'9'
Engine Wheelbase23.17'23.83'
Ratio of driving wheelbase to overall engine wheebase 0.35 0.38
Overall Wheelbase (engine & tender)41.23'45.04'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers60200 lbs66000 lbs
Engine Weight81800 lbs90000 lbs
Tender Light Weight49057 lbs44000 lbs
Total Engine and Tender Weight130857 lbs134000 lbs
Tender Water Capacity2000 gals2200 gals
Tender Fuel Capacity (oil/coal)650 gals900 gals
Minimum weight of rail (calculated)33 lb/yard37 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter40"40"
Boiler Pressure185 psi180 psi
Cylinders (dia x stroke)14" x 20"14" x 20"
Tractive Effort15411 lbs14994 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.91 4.40
Heating Ability
Firebox Area68 sq. ft67 sq. ft
Grate Area17.10 sq. ft13.90 sq. ft
Evaporative Heating Surface1069 sq. ft1029 sq. ft
Superheating Surface
Combined Heating Surface1069 sq. ft1029 sq. ft
Evaporative Heating Surface/Cylinder Volume300.00288.77
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation31642502
Same as above plus superheater percentage31642502
Same as above but substitute firebox area for grate area1258012060
Power L148774593
Power MT535.81460.26


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