Oregon & North Western 2-8-2 "Mikado" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 26 (Locobase 15491)

Data from DeGolyer, Vol 80, pp. 422. See also "Oregon & Northwestern Railroad, Edward Hines Lumber Company" located at Trainweb's [], last accessed on 17 October 2013. Works number was 60834 in May 1929.

Bought by the Edward Hines Western Pine Company, this engine had good proportions with a decent amount of superheating surface area, 61.5 sq ft in two Nicholson thermic syphons to contribute to direct heating surface area, and 12" (305 mm) piston valves.

The EHWPC bid successfully for the Bear Valley concession being offered by the US Forest Service in 1928 and began concentrating its resources to exploit it. The website cited above outlines the difficulties the company would encounter, but notes that the 51 miles (82 km) from Hines, where the sawmill was, to Seneca at the southern end of Bear Valley, was completed in 1929.

The 26 served the O&NW for almost two decades. Most of its operation involved pulling log cars south from Seneca to Hines, although the line was a common carrier. 26's career came to an end on 29 January 1947 when it wrecked and was scrapped.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID15491
RailroadOregon & North Western
Number in Class1
Road Numbers26
Number Built1
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)15 / 4.57
Engine Wheelbase (ft / m)34.33 / 10.46
Ratio of driving wheelbase to overall engine wheelbase 0.44
Overall Wheelbase (engine & tender) (ft / m)75.33 / 22.96
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)210,000 / 95,255
Engine Weight (lbs / kg)282,000 / 127,913
Tender Loaded Weight (lbs / kg)188,000 / 85,275
Total Engine and Tender Weight (lbs / kg)470,000 / 213,188
Tender Water Capacity (gals / ML)10,000 / 37.88
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)4000 / 15,140
Minimum weight of rail (calculated) (lb/yd / kg/m)88 / 44
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)57 / 1448
Boiler Pressure (psi / kPa)200 / 13.80
High Pressure Cylinders (dia x stroke) (in / mm)24" x 30" / 610x762
Tractive Effort (lbs / kg)51,537 / 23376.82
Booster (lbs)11,500
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.07
Heating Ability
Tubes (number - dia) (in / mm)231 - 2" / 51
Flues (number - dia) (in / mm)36 - 5.375" / 137
Flue/Tube length (ft / m)18.75 / 5.71
Firebox Area (sq ft / m2)289.50 / 26.90
Grate Area (sq ft / m2)66.80 / 6.21
Evaporative Heating Surface (sq ft / m2)3494 / 324.72
Superheating Surface (sq ft / m2)777 / 72.21
Combined Heating Surface (sq ft / m2)4271 / 396.93
Evaporative Heating Surface/Cylinder Volume222.41
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation13,360
Same as above plus superheater percentage15,765
Same as above but substitute firebox area for grate area68,322
Power L114,434
Power MT606.12

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