Kentucky & Tennessee 2-6-2 "Prairie" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 8 (Locobase 13816)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 39, p. 46. Works number was 37269 in November 1911.

The K & T took account of its 3% grades that included 16-degree curves, compensated, the maximum curves of 24 degrees, and its rail weights of 60 lb/yard and specified this low-drivered Prairie. The order required the 8 to haul 204 short tons up the 3% grade.

One of its primary duties was to head the passenger train that connected Stearns with Cooperative (13 miles each way) and served the miners who got out the coal in the latter location. After more than 4 decades, the 8 was scrapped in 1951.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID13,816
RailroadKentucky & Tennessee
Number in Class1
Road Numbers8
Number Built1
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 9.50 / 2.90
Engine Wheelbase (ft / m)24.50 / 7.47
Ratio of driving wheelbase to overall engine wheebase 0.39
Overall Wheelbase (engine & tender) (ft / m)48.82 / 14.88
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)110,000 / 49,895
Engine Weight (lbs / kg)140,000 / 63,503
Tender Loaded Weight (lbs / kg)90,000 / 40,823
Total Engine and Tender Weight (lbs / kg)230,000 / 104,326
Tender Water Capacity (gals / ML)4500 / 17.05
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)6 / 5.50
Minimum weight of rail (calculated) (lb/yd / kg/m)61 / 30.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)51 / 1295
Boiler Pressure (psi / kPa)170 / 11.70
High Pressure Cylinders (dia x stroke) (in / mm)20" x 24" / 508x610
Tractive Effort (lbs / kg)27,200 / 12337.73
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.04
Heating Ability
Firebox Area (sq ft / m2)124 / 11.52
Grate Area (sq ft / m2)34 / 3.16
Evaporative Heating Surface (sq ft / m2)2135 / 198.35
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)2135 / 198.35
Evaporative Heating Surface/Cylinder Volume244.65
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation5780
Same as above plus superheater percentage5780
Same as above but substitute firebox area for grate area21,080
Power L14562
Power MT274.29

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Wes Barris