Cherry Valley 2-8-2 "Mikado" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 101 (Locobase 14129)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 47, p. 275+. See also Donald B Robertson, Encyclopedia of Western Railroad History, Volume III: Oregon, Washington (Caldwell, Idaho: Caxton Printers, Ltd, 1995), p. 200 and Allan Miller, "Cherry Valley Logging Company," The Valley Record (27 November 1980), archived at [], last accessed 6 May 2012. (Thanks to Steve Low for his 22 June 2017 email pointing out some errors in the comments that led to confusion.) Works number was 39787 in May 1913.

Cherry Valley exploited its timber holdings near Stillwater, Wash, with Shay geared locomotives numbered 1-3 for the most part. They trundled along the main line's 56 lb/yard (28 kg/metre) rail and the miles of logging road from Stillwater to Tolt; total distance was about 50 miles (80.5 km). Eleven years after the company first began grading the road and some years after they bought their first Shay, CV plumped for a heavier rod-driven logging Mikado in the same month they bought their heaviest Shay (#3).

The specs called for the oil-burning Mike to be able to climb 5% grades combined with curves of 15 to 20 degrees and to get around maximum curvatures of 30 degrees. An element of economy surfaces in the inked instruction to make the front truck wheels interchangeable with those of the tender.

Apparently to certify its many differences from the Shays, the company gave the 2-8-2 number 101. (See Locobase 14698 for the later #4, which was considerably smaller.)

Locobase 13934 describes the Sliver Falls Timber Company's Mikado (also numbered #101), built two months earlier in the same year to the exact specs shown here for the Cherry Valley. As that entry notes, the SFTC 2-8-2 showed several defects in its oil-burning firebox that its owner had to repair.

The CV's spec described the "boiler and fitting, including injector checks" as "exact duplicate of 12 34 1/4 E 23." That engine was the SFTC 101.

In 1930, when the CVLC was sold to Weyerhaeuser, the new owner retained both the Mike and its number.

Class 4/104 (Locobase 14698)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 62, pp. 313+. See Allan Miller, "Cherry Valley Logging Company --The Valley Record: November 27, 1980" at [] . (Thanks to Steve Low for his 22 June 2017 email pointing out some errors in the comments that led to confusion.) Works number was 52192 in August 1919.

Locobase 14129 describes the larger Mikado 101 delivered in 1913; this was a smaller engine in every respect. It was also an oil-burner. Its front and rear engine trucks were interchangeable.

When the CV ordered the Mikado described here, the Cherry Valley Logging Company had added F E Weyerhaueser to the board and had begun looking for new business. Miller reports "In late 1917, during the height of World War I, Cherry Valley Logging Company, like many others, was taken over by the Loyal Legion of Loggers and Lumbermen, the United States Government Spruce Division. Before this time spruce had never been considered desirable for lumber, but suddenly the airplane emerged as effective weapon in war. Practically overnight there came a huge demand for high-quality spruce in the construction of airplanes. Hundreds of uniformed soldiers (mostly from the Carolinas) were put to work in the woods, lifting productions to heights even Paul Bunyan himself would find hard to match."

When the road closed in 1930, the assets were bought by Weyerhaueser, who renumbered the 4 as #104.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID14129 14698
RailroadCherry ValleyCherry Valley
Number in Class12
Road Numbers1014/104
Number Built12
Valve GearStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)13.08 / 3.9912.08 / 3.68
Engine Wheelbase (ft / m)27 / 8.2327.25 / 8.31
Ratio of driving wheelbase to overall engine wheelbase 0.48 0.44
Overall Wheelbase (engine & tender) (ft / m)54.33 / 16.5650.10 / 15.27
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)139,000 / 63,049113,400 / 51,437
Engine Weight (lbs / kg)175,000 / 79,379140,800 / 63,866
Tender Loaded Weight (lbs / kg)80,000 / 36,28770,000 / 31,752
Total Engine and Tender Weight (lbs / kg)255,000 / 115,666210,800 / 95,618
Tender Water Capacity (gals / ML)4000 / 15.153500 / 13.26
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)2000 / 75701600 / 6056
Minimum weight of rail (calculated) (lb/yd / kg/m)58 / 2947 / 23.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)48 / 121944 / 1118
Boiler Pressure (psi / kPa)170 / 11.70180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)20.5" x 28" / 521x71118" x 24" / 457x610
Tractive Effort (lbs / kg)35,424 / 16068.0827,039 / 12264.70
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.92 4.19
Heating Ability
Tubes (number - dia) (in / mm)350 - 2" / 51291 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)16.50 / 5.0313 / 3.96
Firebox Area (sq ft / m2)149 / 13.84140 / 13.01
Grate Area (sq ft / m2)41.30 / 3.8425.50 / 2.37
Evaporative Heating Surface (sq ft / m2)3157 / 293.402108 / 195.91
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)3157 / 293.402108 / 195.91
Evaporative Heating Surface/Cylinder Volume295.05298.16
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation70214590
Same as above plus superheater percentage70214590
Same as above but substitute firebox area for grate area25,33025,200
Power L149605243
Power MT314.67407.72

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