Carpenter-O'Brien Company 2-6-2 "Prairie" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 1 (Locobase 14293)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Vol 52, pp. 330. See also the National Parks Service's Special Study at [] . Works numbers were 41649-41651 in July 1914.

Carpenter-O'Brien logged timber holdings in Florida, a job for which these lightly loaded, low-drivered Prairies, burning wood and sporting Radley & Hunter cabbage stacks, were well-suited.

Each of the three had a different career with the 1 being the best known. It operated in support of the company's Eastport, Fla mill. Brooks-Scanlon bought the company in December 1917. The 1 continued in B-S service throughout World War II, first in Eastport, then after 1929 at Foley. At some point the cabbage stack was replaced by a straight (aka "shotgun") stack.

In 1947, B-S sold the 1 to the Lee Tidewater Cypress Company, which operated the 1 until 1959. F Nelson Blount bought the 1 in 1962 and moved it to Bellows Falls, Vt where it joined many other engines at Steamtown. The display moved to Scranton, Pa and was designated a National Historical Site in 1988.

3 was sold by B-S to Revell Crate of Wauchula, Fla. It was donated in January 1967 to the Peace River Valley Historical Society of Zolfo Springs and went on display in that town's Pioneer Park. According to the Cracker Trail Museum and Village website ([]), the 3 was also known as the "Loping Gopher".

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID14,293
RailroadCarpenter-O'Brien Company
Number in Class3
Road Numbers1, 3, 5
Number Built3
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 9.17 / 2.80
Engine Wheelbase (ft / m)24.67 / 7.52
Ratio of driving wheelbase to overall engine wheebase 0.37
Overall Wheelbase (engine & tender) (ft / m)46.92 / 14.69
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)82,900 / 37,195
Engine Weight (lbs / kg)109,000 / 49,895
Tender Loaded Weight (lbs / kg)70,000 / 27,216
Total Engine and Tender Weight (lbs / kg)179,000 / 77,111
Tender Water Capacity (gals / ML)3500 / 11.36
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT) / 5.50
Minimum weight of rail (calculated) (lb/yd / kg/m)46 / 23
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)44 / 1168
Boiler Pressure (psi / kPa)180 / 13.80
High Pressure Cylinders (dia x stroke) (in / mm)16" x 24" / 406x610
Tractive Effort (lbs / kg)21,364 / 9690.56
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.88
Heating Ability
Firebox Area (sq ft / m2)112 / 10.41
Grate Area (sq ft / m2)16 / 1.49
Evaporative Heating Surface (sq ft / m2)1594 / 148.09
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1594 / 148.09
Evaporative Heating Surface/Cylinder Volume285.40
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2880
Same as above plus superheater percentage2880
Same as above but substitute firebox area for grate area20,160
Power L15091
Power MT406.17

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Wes Barris