Ocean Shore 2-6-2 "Prairie" Locomotives in 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.)

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID13,261
RailroadOcean Shore
Number in Class2
Road Numbers9-10
Number Built2
BuilderBurnham, Williams & Co
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)9 / 2.74
Engine Wheelbase (ft / m)23.50 / 7.16
Ratio of driving wheelbase to overall engine wheebase 0.38
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)110,000 / 49,895
Engine Weight (lbs / kg)156,000 / 70,760
Tender Loaded Weight (lbs / kg)80,000 / 36,287
Total Engine and Tender Weight (lbs / kg)236,000 / 107,047
Tender Water Capacity (gals / ML)4000 / 15.15
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)2800 / 10.60
Minimum weight of rail (calculated) (lb/yd / kg/m)61 / 30.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)48 / 1219
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)20" x 24" / 508x610
Tractive Effort (lbs / kg)30,600 / 13879.94
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.59
Heating Ability
Firebox Area (sq ft / m2)145 / 13.47
Grate Area (sq ft / m2)33 / 3.07
Evaporative Heating Surface (sq ft / m2)2404 / 223.34
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)2404 / 223.34
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 area26,100
Power L15163
Power MT310.43

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