Oahu Sugar Co. 0-6-2ST
United States 1897 0 produced
The Oahu Sugar Company operated a network of three-foot lines on the Hawaiian island of the same name that reached its maximum extent in 1939 with 60 miles or 97 km. It contained grades of up to three percent and very tight curves. Their main motive power consisted of a number of 0-6-2 saddle tank locomotives built by Baldwin from 1897.
They were originally fired by wood or even by sugar canes, since this was a fuel that could be obtained free of charge from the plantations. Starting in 1908, they were converted for oil firing. Although the company lasted much longer, the rail network was closed in 1950. Today three are surviving, which are No. 1 “Waipahu”, No. 5 “Waikakalua” and No. 7 “Puuloa”.
Technical data
General
| Property | as built | oil-fired |
|---|---|---|
| Built | 1897-1921 | |
| Manufacturers | Baldwin | |
| Wheel arrangement | 0-6-2ST (Webb) | |
| Gauge | 914 mm (Three feet) | |
Dimensions and weights
| Property | as built | oil-fired |
|---|---|---|
| Wheelbase | 4.04 m | |
| Service mass | 23.1 t | |
| Adhesion mass | 20 t | 20.4 t |
| Rigid wheelbase | 2.13 m | |
| Axle load | 6.7 t | 6.8 t |
| Water capacity | 2,082 l | 2,461 l |
| Fuel capacity | 0.1 t (oil) | |
Boiler
| Property | as built | oil-fired |
|---|---|---|
| Grate area | 0.818 m² | |
| Firebox surface | 3.67 m² | |
| Tube heating surface | 38.137 m² | |
| Evaporative heating surface | 41.806 m² | |
| Total heating surface | 41.8 m² | |
Power plant
| Property | as built | oil-fired |
|---|---|---|
| Driver diameter | 838 mm | |
| Boiler pressure | 11 bar | |
| Expansion type | simple expansion | |
| Cylinders | two, 305 x 406 mm | |
Power
| Property | as built | oil-fired |
|---|---|---|
| Power source | steam | |
| Estimated power | 134 kW (182 PS) | 149 kW (203 PS) |
| Starting effort | 42.2 kN | |
Calculated values
| Property | as built | oil-fired |
|---|---|---|
| Factor of adhesion | 1 : 4.64 | 1 : 4.74 |
| Optimal speed | 19 km/h | 21 km/h |
| Power-to-weight ratio | 5.8 kW/t | 6.4 kW/t |
| Heating Surface Equivalent | 60.2 m² | |
| Cylinder volume/HSE | 1 : 985.86 | |
| Adhesive weight/Total | 1 : 1.16 | 1 : 1.13 |
| Tractive force/Heating surface | 1 : 21.10 | |
| Grate area/Heating surface | 1 : 51.11 | |
| Firebox/Tube surface | 1 : 10.39 | |
