Porto Alegre a Uruguayana 2-4-2 Locomotives in Brazil


Class Details by Steve Llanso of Sweat House Media

Class 9 (Locobase 11831)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Methodist University Volume 12, p. 119 and Volume 17, p. 5. Works numbers were 7482 in October 1884 and 11832-11833 in April 1891.

One has to conclude that this little tank design had some special qualities as far as the PA&U was concerned. The second and third were ordered seven years after the first.

Principal Dimensions by Steve Llanso of Sweat House Media

Class9
Locobase ID11831
RailroadPorto Alegre a Uruguayana
CountryBrazil
Whyte2-4-2ST
Number in Class3
Road Numbers9, 39-40 / 43, 11-12
GaugeMetre
Number Built3
BuilderBurnham, Parry, Williams & Co
Year1884
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)5 / 1.52
Engine Wheelbase (ft / m)18.50 / 5.64
Ratio of driving wheelbase to overall engine wheelbase 0.27
Overall Wheelbase (engine & tender) (ft / m)18.50 / 5.64
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)28,000 / 12,701
Engine Weight (lbs / kg)42,000 / 19,051
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)42,000 / 19,051
Tender Water Capacity (gals / ML)550 / 2.08
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)23 / 11.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)41 / 1041
Boiler Pressure (psi / kPa)130 / 9
High Pressure Cylinders (dia x stroke) (in / mm)11" x 16" / 279x406
Tractive Effort (lbs / kg)5218 / 2366.85
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.37
Heating Ability
Tubes (number - dia) (in / mm)92 - 1.5" / 38
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m) 8.17 / 2.49
Firebox Area (sq ft / m2)51.50 / 4.78
Grate Area (sq ft / m2) 8.72 / 0.81
Evaporative Heating Surface (sq ft / m2)345 / 32.05
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)345 / 32.05
Evaporative Heating Surface/Cylinder Volume196.04
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1134
Same as above plus superheater percentage1134
Same as above but substitute firebox area for grate area6695
Power L13041
Power MT478.87

All material Copyright © SteamLocomotive.com
Wes Barris