Red River & Gulf 2-6-2 "Prairie" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 1 (Locobase 16339)

Data from "Pacific [sic] Type Engine Built at Lima", Railway and Locomotive Engineering, Volume XVIII [18], No 8 (August 1905), p. 347. Works number was 1009 in May 1905.

Although the R&LE report makes some obvious errors, the description otherwise seems reliable. This logging Prairie could burn either coal or wood and had a flared, spark-arresting stack ahead of two closely spaced domes (sand and steam). Only the middle set of drivers, which took the main rod thrust, were flanged. Front and rear driver sets had 6" (152 mm) wide tires.

At the time of the 1's arrival, the RR&G was owned by Crowell & Spencer Lumber Company. The engine would remain with the logger until it was sold to the Meridian Lumber Company as their #1. Meridian sold the 1 to Fordyce Lumber Company in 1929 to run on the Fordyce & Princeton.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID16,339
RailroadRed River & Gulf
Number in Class1
Road Numbers1
Number Built1
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 9.17 / 2.80
Engine Wheelbase (ft / m)23.75 / 7.24
Ratio of driving wheelbase to overall engine wheebase 0.39
Overall Wheelbase (engine & tender) (ft / m)47.17 / 14.38
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)60,800 / 27,578
Engine Weight (lbs / kg)84,000 / 38,102
Tender Loaded Weight (lbs / kg)79,000 / 35,834
Total Engine and Tender Weight (lbs / kg)163,000 / 73,936
Tender Water Capacity (gals / ML)3000 / 15.15
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT) / 3.60
Minimum weight of rail (calculated) (lb/yd / kg/m)34 / 17
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)46 / 1168
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)15" x 20" / 381x508
Tractive Effort (lbs / kg)14,967 / 6788.93
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.06
Heating Ability
Firebox Area (sq ft / m2)75.60 / 7.02
Grate Area (sq ft / m2)14.12 / 1.31
Evaporative Heating Surface (sq ft / m2)994 / 92.34
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)994 / 92.34
Evaporative Heating Surface/Cylinder Volume243.00
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2542
Same as above plus superheater percentage2542
Same as above but substitute firebox area for grate area13,608
Power L14629
Power MT503.55

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Wes Barris