San Joaquin & Eastern 2-6-2 "Prairie" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 205 (Locobase 14336)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Vol 71, pp. 165+.Works number was 57613 in January 1924.

Locobase 14335 discusses the history of the Slow, Jerky & Expensive. This Prairie came ten years after the earlier Baldwin and featured some superheating and shorter drivers. Piston valves measured 9 1/2" (241 mm) in diameter.

When the SJ&E closed in 1933, the 205 was sold in November to the Santa Maria Valley to haul oil and asphalt between Roadamite to Guadalupe, Calif. When the 205 was retired in 1950, it was donated in May to the city of Santa Maria, where it stood on display for over 30 years. George Lavacat bought the engine in 1983 and stored it on the Willamina & Grande Ronde Railroad.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID14336
RailroadSan Joaquin & Eastern
Number in Class1
Road Numbers205
Number Built1
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)10.25 / 3.12
Engine Wheelbase (ft / m)26.92 / 8.21
Ratio of driving wheelbase to overall engine wheebase 0.38
Overall Wheelbase (engine & tender) (ft / m)50.92 / 15.52
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)98,000 / 44,452
Engine Weight (lbs / kg)128,000 / 58,060
Tender Loaded Weight (lbs / kg)96,000 / 43,545
Total Engine and Tender Weight (lbs / kg)224,000 / 101,605
Tender Water Capacity (gals / ML)4500 / 17.05
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)1800 / 6.80
Minimum weight of rail (calculated) (lb/yd / kg/m)54 / 27
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)49 / 1245
Boiler Pressure (psi / kPa)195 / 13.40
High Pressure Cylinders (dia x stroke) (in / mm)17" x 24" / 432x610
Tractive Effort (lbs / kg)23,462 / 10642.20
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.18
Heating Ability
Firebox Area (sq ft / m2)102 / 9.48
Grate Area (sq ft / m2)18.70 / 1.74
Evaporative Heating Surface (sq ft / m2)1257 / 116.78
Superheating Surface (sq ft / m2)274 / 25.46
Combined Heating Surface (sq ft / m2)1531 / 142.24
Evaporative Heating Surface/Cylinder Volume199.37
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation3647
Same as above plus superheater percentage4303
Same as above but substitute firebox area for grate area23,470
Power L110,692
Power MT721.59

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Wes Barris