Lehigh Valley 2-6-2 "Prairie" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class I-1 (Locobase 12614)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 24, p. 290. Works numbers were 20574-20575, 20600-20601 in June 1902; 22464, 22472, 22485, 22487 in July 1903; 24384-24385 in June 1904.

During the brief North American infatuation with the Prairie wheel arrangement for express passenger locomotives, the Lehigh Valley bought the only camelback 2-6-2s. And they didn't skimp, adopting a large grate and big boiler for the relatively small cylinder volume.

They were rebuilt in 1906 with a four-wheel leading truck and redesignated K-2, thus following the trend toward use of the Pacific wheel arrangement.

Specifications by Steve Llanso of Sweat House Media
Locobase ID12614
RailroadLehigh Valley (LV)
Number in Class10
Road Numbers790-799 / 2230-2239
Number Built10
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase13.50'
Engine Wheelbase31.25'
Ratio of driving wheelbase to overall engine wheebase 0.43
Overall Wheelbase (engine & tender)
Axle Loading (Maximum Weight per Axle)
Weight on Drivers135000 lbs
Engine Weight200000 lbs
Tender Light Weight130000 lbs
Total Engine and Tender Weight330000 lbs
Tender Water Capacity6500 gals
Tender Fuel Capacity (oil/coal)
Minimum weight of rail (calculated)75 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter76.50"
Boiler Pressure200 psi
Cylinders (dia x stroke)22" x 26"
Tractive Effort27964 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.83
Heating Ability
Firebox Area212.80 sq. ft
Grate Area87.70 sq. ft
Evaporative Heating Surface3670 sq. ft
Superheating Surface
Combined Heating Surface3670 sq. ft
Evaporative Heating Surface/Cylinder Volume320.83
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation17540
Same as above plus superheater percentage17540
Same as above but substitute firebox area for grate area42560
Power L110553
Power MT517.01


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