Baldwin 4-6-0 "Ten-Wheeler" Locomotives in 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. See also "A very remarkable train .... " note, Railroad & Engineering Journal, Volume LXVI [66], No 2 (June 1892), p. 254. 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.

R&EJ 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.

Principal Dimensions by Steve Llanso of Sweat House Media
ClassBaldwin compound
Locobase ID12,007
Number in Class1
Road Numbers82
Number Built1
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)12.50 / 3.81
Engine Wheelbase (ft / m)31.17 / 9.50
Ratio of driving wheelbase to overall engine wheebase 0.40
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)98,000 / 44,452
Engine Weight (lbs / kg)125,000 / 56,699
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)2600 / 9.85
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)54 / 27
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)72 / 1829
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)14" x 24" / 356x610
Low Pressure Cylinders (dia x stroke) (in / mm)24" x 24" / 610x610
Tractive Effort (lbs / kg)14,916 / 6765.79
Factor of Adhesion (Weight on Drivers/Tractive Effort) 6.57
Heating Ability
Firebox Area (sq ft / m2)169.70 / 15.77
Grate Area (sq ft / m2)27.50 / 2.56
Evaporative Heating Surface (sq ft / m2)2135 / 198.42
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)2135 / 198.42
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 area30,546
Power L15128
Power MT346.08

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