St Louis Water Works 2-6-2 "Prairie" Locomotives in 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.

Principal Dimensions by Steve Llanso of Sweat House Media
Class2
Locobase ID13,692
RailroadSt Louis Water Works
CountryUSA
Whyte2-6-2
Number in Class1
Road Numbers2
GaugeStd
Number Built1
BuilderBaldwin
Year1910
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)10.50 / 3.20
Engine Wheelbase (ft / m)26.58 / 8.10
Ratio of driving wheelbase to overall engine wheebase 0.40
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)98,000 / 44,452
Engine Weight (lbs / kg)134,000 / 60,781
Tender Loaded Weight (lbs / kg)70,000 / 31,752
Total Engine and Tender Weight (lbs / kg)204,000 / 92,533
Tender Water Capacity (gals / ML)3500 / 13.26
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)6 / 5.50
Minimum weight of rail (calculated) (lb/yd / kg/m)54 / 27
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)44 / 1118
Boiler Pressure (psi / kPa)180 / 11
High Pressure Cylinders (dia x stroke) (in / mm)17" x 24" / 432x610
Tractive Effort (lbs / kg)24,118 / 10939.75
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.06
Heating Ability
Firebox Area (sq ft / m2)128.60 / 11.95
Grate Area (sq ft / m2)15.80 / 1.47
Evaporative Heating Surface (sq ft / m2)2401 / 223.06
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)2401 / 223.06
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 area23,148
Power L16373
Power MT430.10