Sierra Nevada Wood & Lumber Company 2-6-2 "Prairie" Locomotives in the USA


Class Details by Steve Llanso of Sweat House Media

Class 8 (Locobase 12473)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Vol 31, p. 76. Works number was 32160 in November 1907.

This Prairie worked for several logging-related railways. When the Hobart Southern was abandoned in December 1937, the 8 was sold to the Clover Valley Lumber Company. After another 18 years in service, the 8 moved on to the Feather River Lumber Company.

In 1958, the 8 moved into museum railroading when it was sold to the Plumas County Fair. 27 years later, Plumas County sold the 8 to the Feather River Rail Society. And the FRRS sold the locomotive to the Virginia & Truckee.


Class W S Hobart (Locobase 12471)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Vol 23, p. 204. Works number was 18665 in February 1901.

The SNW & LC was headquartered in Hobart Mills, California. In 1916, the 8-mile railway supporting the mill was renamed the Hobart Estate. In 1924, the again-renamed Hobart Southern became a wholly owned subsidiary of the Southern Pacific. It was abandoned in 1937, but the #4 wasn't scrapped until 1945.

Principal Dimensions by Steve Llanso of Sweat House Media
Class8W S Hobart
Locobase ID12,473 12,471
RailroadSierra Nevada Wood & Lumber CompanySierra Nevada Wood & Lumber Company
CountryUSAUSA
Whyte2-6-22-6-2
Number in Class11
Road Numbers84
GaugeStdStd
Number Built11
BuilderBurnham, Williams & CoBurnham, Williams & Co
Year19071901
Valve GearStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 7.67 / 2.348 / 4.80
Engine Wheelbase (ft / m)23.83 / 7.2622.75 / 7.42
Ratio of driving wheelbase to overall engine wheebase 0.32 0.35
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)60,000 / 27,21656,000 / 25,401
Engine Weight (lbs / kg)108,000 / 48,98876,000 / 34,473
Tender Loaded Weight (lbs / kg)70,000 / 31,75247,000 / 21,319
Total Engine and Tender Weight (lbs / kg)178,000 / 80,740123,000 / 55,792
Tender Water Capacity (gals / ML)3500 / 13.262000 / 7.58
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)33 / 16.5031 / 15.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)44 / 111844 / 1118
Boiler Pressure (psi / kPa)160 / 11160 / 11
High Pressure Cylinders (dia x stroke) (in / mm)16" x 24" / 406x61013" x 22" / 330x559
Tractive Effort (lbs / kg)18,991 / 8614.1811,492 / 5212.69
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.16 4.87
Heating Ability
Firebox Area (sq ft / m2)128 / 11.9074 / 6.88
Grate Area (sq ft / m2)16 / 1.4913.30 / 1.24
Evaporative Heating Surface (sq ft / m2)1567 / 145.63767 / 71.28
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1567 / 145.63767 / 71.28
Evaporative Heating Surface/Cylinder Volume280.57226.94
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation25602128
Same as above plus superheater percentage25602128
Same as above but substitute firebox area for grate area20,48011,840
Power L146373947
Power MT511.14466.16

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