Harbor Plywood 2-8-2 "Mikado" Locomotives in the USA
Class Details by Steve Llanso of Sweat House Media
Class 4 (Locobase 16438)
Data from American Locomotive Company builder's card for Order No. B-1671, February 1925, supplied in June 2019 by Steve Low through an email. See also Doug Evans, "08 Blog Item Number 8 - Elsie", entered 10 July 2008 at [
], last accessed 2 July 2019. (Many thanks to Steve Low for filling the hole.) Works number was 66167 in January 1925.
Locobase 14273 describes the basic design of this Alco logging Mikado. An identical sister to the four sold at the same time to Long Bell Lumber (Locobase 14274), this saddle-tank soon went to Winlock & Toledo Logging of Winlock, Wash (see the Lewis County website at Logging Industry in Lewis Co., Washington, at [], last accessed 2 July 2019).
The 4 later went to Dallas, Ore to run on the Willamette Valley Lumber rails.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 4 |
| Locobase ID | 16438 |
| Railroad | Harbor Plywood |
| Country | USA |
| Whyte | 2-8-2ST |
| Number in Class | 2 |
| Road Numbers | 4 |
| Gauge | Std |
| Number Built | 2 |
| Builder | Alco-Brooks |
| Year | 1925 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 13.25 / 4.04 |
| Engine Wheelbase (ft / m) | 27.83 / 8.48 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.48 |
| Overall Wheelbase (engine & tender) (ft / m) | 27.83 / 8.48 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 120,500 / 54,658 |
| Engine Weight (lbs / kg) | 168,000 / 76,204 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | 168,000 |
| Tender Water Capacity (gals / ML) | 2000 / 7.58 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 1000 / 3785 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 50 / 25 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 44 / 1118 |
| Boiler Pressure (psi / kPa) | 190 / 1310 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 18" x 24" / 457x610 |
| Tractive Effort (lbs / kg) | 28,541 / 12946.00 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.22 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 120 - 2" / 51 |
| Flues (number - dia) (in / mm) | 19 - 5.375" / 137 |
| Flue/Tube length (ft / m) | 12.50 / 3.81 |
| Firebox Area (sq ft / m2) | 113 / 10.50 |
| Grate Area (sq ft / m2) | 25.20 / 2.34 |
| Evaporative Heating Surface (sq ft / m2) | 1225 / 113.85 |
| Superheating Surface (sq ft / m2) | 260 / 24.16 |
| Combined Heating Surface (sq ft / m2) | 1485 / 138.01 |
| Evaporative Heating Surface/Cylinder Volume | 173.27 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 4788 |
| Same as above plus superheater percentage | 5650 |
| Same as above but substitute firebox area for grate area | 25,335 |
| Power L1 | 8139 |
| Power MT | 595.63 |