Yosemite Valley 4-4-0 "American" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 22 (Locobase 11369)

Data from "Equipment and Supplies: Locomotive Building, Railway Age Gazette, Vol XLII, no 14 (5 April 1907), p. 498 and the YVRR history website at http://www.yosemitevalleyrailroad.com/MOTIVE.POWER.HTML.DIR/YVRR.Blind.Photo.html . Works numbers were 43167 and 44389. Purchase prices were $13,589.42 and $14,734.99

This pair was the modern passenger power for the YVRR. They had a small grate for the boiler, which suggests that they didn't have to run far on any particular service. The website's photos shows the very short trains these engines would haul. And they were suitable for as long as rail passenger service could compete with buses or cars in the Yosemite Valley.

NB: The direct heating surface (including the firebox heating surface) is an estimate calculated by subtracting the calculated tube heating surface from the reported total evaporative heating surface.

Specifications by Steve Llanso of Sweat House Media
Locobase ID11369
RailroadYosemite Valley
Number in Class1
Road Numbers22-23
Number Built1
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase
Engine Wheelbase
Ratio of driving wheelbase to overall engine wheebase
Overall Wheelbase (engine & tender)
Axle Loading (Maximum Weight per Axle)
Weight on Drivers72000 lbs
Engine Weight110000 lbs
Tender Light Weight
Total Engine and Tender Weight
Tender Water Capacity4000 gals
Tender Fuel Capacity (oil/coal)2250 gals
Minimum weight of rail (calculated)60 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter63"
Boiler Pressure165 psi
Cylinders (dia x stroke)18" x 26"
Tractive Effort18753 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.84
Heating Ability
Firebox Area182 sq. ft
Grate Area17 sq. ft
Evaporative Heating Surface1700 sq. ft
Superheating Surface
Combined Heating Surface1700 sq. ft
Evaporative Heating Surface/Cylinder Volume222.00
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2805
Same as above plus superheater percentage2805
Same as above but substitute firebox area for grate area30030
Power L15905
Power MT361.62

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