Baldwin 4-6-0 "Ten-wheeler" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class Baldwin compound (Locobase 12007)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 17, p. 131. Works number was 12286 in October 1891.

This demonstrator is credited with sparking considerable interest in Samuel Vauclain's four-cylinder compounding system. Arguing for its usefulness as a true mixed-traffic locomotive, Baldwin built a large Ten-wheeler with relatively tall drivers, painted it olive green and gold, and let railroads across the country try out the design over the next five years.

The June 1892 Railroad & Engineering Journal (p. 254) reported that the 82 ran continuously from Philadelphia to Chicago, stopping only to refuel and take on water. Its train consisted of 20 Forney locomotives intended for use on the Chicago & South Side Elevated.

After its career as a demonstrator, 82 was rebuilt in 1896 as a simple-expansion freight engine with 19" x 24" and 54" drivers. It was sold to the Coudersport & Port Allegany as its #1 and operated for 45 more years.

Specifications by Steve Llanso of Sweat House Media
ClassBaldwin compound
Locobase ID12007
Number in Class1
Road Numbers82
Number Built1
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase12.50'
Engine Wheelbase31.17'
Ratio of driving wheelbase to overall engine wheebase 0.40
Overall Wheelbase (engine & tender)
Axle Loading (Maximum Weight per Axle)
Weight on Drivers98000 lbs
Engine Weight125000 lbs
Tender Light Weight
Total Engine and Tender Weight
Tender Water Capacity2600 gals
Tender Fuel Capacity (oil/coal)
Minimum weight of rail (calculated)54 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter72"
Boiler Pressure180 psi
High Pressure Cylinders (dia x stroke)14" x 24"
Low Pressure Cylinders (dia x stroke)24" x 24" (2)
Tractive Effort14916 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 6.57
Heating Ability
Firebox Area169.70 sq. ft
Grate Area27.50 sq. ft
Evaporative Heating Surface2135 sq. ft
Superheating Surface
Combined Heating Surface2135 sq. ft
Evaporative Heating Surface/Cylinder Volume499.29
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation4950
Same as above plus superheater percentage4950
Same as above but substitute firebox area for grate area30546
Power L15128
Power MT346.08

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