St Louis Water Works 2-6-2 "Prairie" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 2 (Locobase 13692)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 35, p. 331. (Thanks to Chris Hohl for his 4 April 2015 email correcting the locomotive's boiler pressure and engine weight.) See Locobase 13263 for a history of the StL WW.Works number was 35159 in August 1910.

Locobase cannot figure out why Baldwin supplied a locomotive with such an outlandish ratio of heating surface area to grate area. The specs confirm the numbers and the ratio.

This Prairie freighter served the Water Works for 17 years before being sold east to locomotive rebuilder/reseller Birmingham Rail & Locomotive in May 1927. BR&L turned the engine around quickly, sending to the Tennessee & North Carolina a month later as their 105. Based in Newport, Tenn, the road remained open until 1951.

Specifications by Steve Llanso of Sweat House Media
Locobase ID13692
RailroadSt Louis Water Works
Number in Class1
Road Numbers2
Number Built1
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase10.50'
Engine Wheelbase26.58'
Ratio of driving wheelbase to overall engine wheebase 0.40
Overall Wheelbase (engine & tender)
Axle Loading (Maximum Weight per Axle)
Weight on Drivers98000 lbs
Engine Weight134000 lbs
Tender Light Weight70000 lbs
Total Engine and Tender Weight204000 lbs
Tender Water Capacity3500 gals
Tender Fuel Capacity (oil/coal)6 tons
Minimum weight of rail (calculated)54 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter44"
Boiler Pressure180 psi
Cylinders (dia x stroke)17" x 24"
Tractive Effort24118 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.06
Heating Ability
Firebox Area128.60 sq. ft
Grate Area15.80 sq. ft
Evaporative Heating Surface2401 sq. ft
Superheating Surface
Combined Heating Surface2401 sq. ft
Evaporative Heating Surface/Cylinder Volume380.81
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2844
Same as above plus superheater percentage2844
Same as above but substitute firebox area for grate area23148
Power L16373
Power MT430.10

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