Ocean Shore 2-6-2 "Prairie" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 9 (Locobase 13261)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 32, p. 318. See Locobase 13260 for a history of the Pacific's OSRR. Works numbers were 33021-33022 in November 1908.

These freight Prairies represented the second pair of new locomotives for the OSRR. Compared to the earlier Moguls, these engines had substantially larger boilers feeding somewhat larger cylinder volumes. The specs show that they'd be fitted with new tires to negotiate extremely tight curves and grades reaching 4%. The company paid $14,613 each for these locomotives.

The 9 and 10 were sold to Warren Spruce Company, which almost immediately sold both to the Pacific Great Eastern of British Columbia as their 4 and 5. (See Locobase 31 for a brief description of the PGE.)

Specifications by Steve Llanso of Sweat House Media
Locobase ID13261
RailroadOcean Shore
Number in Class2
Road Numbers9-10
Number Built2
BuilderBurnham, Williams & Co
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase9'
Engine Wheelbase23.50'
Ratio of driving wheelbase to overall engine wheebase 0.38
Overall Wheelbase (engine & tender)
Axle Loading (Maximum Weight per Axle)
Weight on Drivers110000 lbs
Engine Weight156000 lbs
Tender Light Weight80000 lbs
Total Engine and Tender Weight236000 lbs
Tender Water Capacity4000 gals
Tender Fuel Capacity (oil/coal)2800 gals
Minimum weight of rail (calculated)61 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter48"
Boiler Pressure180 psi
Cylinders (dia x stroke)20" x 24"
Tractive Effort30600 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.59
Heating Ability
Firebox Area145 sq. ft
Grate Area33 sq. ft
Evaporative Heating Surface2404 sq. ft
Superheating Surface
Combined Heating Surface2404 sq. ft
Evaporative Heating Surface/Cylinder Volume275.48
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation5940
Same as above plus superheater percentage5940
Same as above but substitute firebox area for grate area26100
Power L15163
Power MT310.43

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