Bear Creek Logging Company 2-8-2 "Mikado" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 4 (Locobase 15321)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Vol 73, pp. 389+. Works number was 58419 in May 1925.

Small, superheated, oil-fired logging Mikado that served this Wallowa, Oregon timber harvester. Bear Creek was only the first. The engine was headed for tracks of 56 lb/yard (28 kg/metre), grades of up to 8%, and curves as tight as 30 degrees (radii of 193 feet/58.8 metres) and its front and rear trucks arranged to "traverse a maximum curvature of 35 degrees.". Its firebox was to be readily converted to burn coal.

After BCLC folded in 1934, the 4 was sold to Clark & Wilson Lumber Company of Goble, Ore as their #6. When the C&W sent it to its Portland & Southwestern in Scapoose, Ore, they renumbered #20 and put it to work along the Nehalem River.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID15321
RailroadBear Creek Logging Company
Number in Class1
Road Numbers4
Number Built1
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)11.50 / 3.51
Engine Wheelbase (ft / m)25.92 / 7.90
Ratio of driving wheelbase to overall engine wheelbase 0.44
Overall Wheelbase (engine & tender) (ft / m)25.92 / 7.90
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)130,000 / 58,967
Engine Weight (lbs / kg)169,000 / 76,657
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)169,000
Tender Water Capacity (gals / ML)2000 / 7.58
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)800 / 3028
Minimum weight of rail (calculated) (lb/yd / kg/m)54 / 27
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)42 / 1067
Boiler Pressure (psi / kPa)185 / 12.80
High Pressure Cylinders (dia x stroke) (in / mm)18" x 24" / 457x610
Tractive Effort (lbs / kg)29,114 / 13205.90
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.47
Heating Ability
Tubes (number - dia) (in / mm)134 - 2" / 51
Flues (number - dia) (in / mm)21 - 5.375" / 137
Flue/Tube length (ft / m)10.67 / 3.25
Firebox Area (sq ft / m2)100 / 9.29
Grate Area (sq ft / m2)27.70 / 2.57
Evaporative Heating Surface (sq ft / m2)1156 / 107.43
Superheating Surface (sq ft / m2)242 / 22.49
Combined Heating Surface (sq ft / m2)1398 / 129.92
Evaporative Heating Surface/Cylinder Volume163.51
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation5125
Same as above plus superheater percentage5996
Same as above but substitute firebox area for grate area21,645
Power L17023
Power MT476.40

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