Quanah, Acme & Pacific 4-6-0 "Ten-Wheeler" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 23 (Locobase 13508)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 33, p.144. See also Donovan L. Hofsommer, "QUANAH, ACME AND PACIFIC RAILWAY," Handbook of Texas Online ([]), accessed November 29, 2011. Published by the Texas State Historical Association.. Works numbers were 33365 in April 1909 and 34523-34524 in April 1910.

Purchased by the Acme, Red River & Northern, the first of these three Ten-wheelers was lettered during production for the more grandly conceived Quanah Route. Acme Plaster had sparked the opening of the ARR & N in 1902. Owner Sam Lazarus had built 13 miles from Red River to Acme, but in 1909 he hoped to extend the railroad southwest to El Paso and hook up with the Southern Pacific. He added 35 miles to reach Paducah, Tex, another 39 to McBain in 1913, and eventually tacked on another 26 to reach Floydada, 119 miles from Red River.

Although it never reached El Paso, the QA & P mainline proved highly useful to both the Frisco and the Santa Fe and the Quanah Route remained in service into the 1970s.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID13,508
RailroadQuanah, Acme & Pacific
Number in Class1
Road Numbers23, 25, 27
Number Built1
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)13.33 / 4.06
Engine Wheelbase (ft / m)24.50 / 7.47
Ratio of driving wheelbase to overall engine wheebase 0.54
Overall Wheelbase (engine & tender) (ft / m)50.58 / 15.42
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)100,000 / 45,359
Engine Weight (lbs / kg)135,000 / 61,235
Tender Loaded Weight (lbs / kg)140,000
Total Engine and Tender Weight (lbs / kg)275,000
Tender Water Capacity (gals / ML)7000 / 13.64
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)12
Minimum weight of rail (calculated) (lb/yd / kg/m)56 / 28
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)62 / 1575
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)19" x 26" / 483x660
Tractive Effort (lbs / kg)23,162 / 10506.12
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.32
Heating Ability
Firebox Area (sq ft / m2)145 / 13.47
Grate Area (sq ft / m2)29.30 / 2.72
Evaporative Heating Surface (sq ft / m2)2048 / 190.26
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)2048 / 190.26
Evaporative Heating Surface/Cylinder Volume240.03
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation5274
Same as above plus superheater percentage5274
Same as above but substitute firebox area for grate area26,100
Power L16045
Power MT399.81

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