Pacific National Lumber 2-8-2 "Mikado" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 1 (Locobase 16437)

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 numbers were 66276-66277 in March 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 began its career with the Pacific National Lumber Company near Mount Rainiier. The PNLC soon sold the 1 to La Grande, Ore-based Mount Emily Lumber, but that company found rod-driven locomotives like the 1 unsuitable for the logging roads and the engine was sold again in November 1929 to Long Bell Lumber as their 805. LBL kept the 805 until they sold it for scrap years later.

The number 2 went directly to Mount Emily, but as it was built to the same design as the 1, it too went off to LBL in November 1925 as their 804. After service with LBL, the 804 went to the Harbor Plywood company.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID16437
RailroadPacific National Lumber
Number in Class2
Road Numbers1-2
Number Built2
Valve GearWalschaert
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 / 13.10
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 Volume173.27
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation4788
Same as above plus superheater percentage5650
Same as above but substitute firebox area for grate area25,335
Power L18139
Power MT595.63

All material Copyright ©
Wes Barris