Rio Doce 2-6-2 Locomotives in Brazil


Class Details by Steve Llanso of Sweat House Media

Class Alfonso Penna (Locobase 12099)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 19, p. 72 Works number was 13904 in January 1894.

Clearly intended to reduce axle loadings, the Alfonso Penna was unusual in deploying 5 axles to support such a small boiler on the metre gauge. Its specification included a requirement to scale 3% grades.

Later operated by Central do Brasil as #16.

Principal Dimensions by Steve Llanso of Middle Run Media

ClassAlfonso Penna
Locobase ID12099
RailroadRio Doce
CountryBrazil
Whyte2-6-2T
Number in Class1
Road Numbers2
GaugeMetre
Number Built1
BuilderBurnham, Williams & Co
Year1894
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 8.33 / 2.54
Engine Wheelbase (ft / m)22.50 / 6.86
Ratio of driving wheelbase to overall engine wheelbase 0.37
Overall Wheelbase (engine & tender) (ft / m)22.50 / 6.86
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)37,000 / 16,783
Engine Weight (lbs / kg)51,000 / 23,133
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)51,000 / 23,133
Tender Water Capacity (gals / ML)650 / 2.46
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)21 / 10.50
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)12" x 18" / 305x457
Tractive Effort (lbs / kg)6986 / 3168.80
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.30
Heating Ability
Tubes (number - dia) (in / mm)59 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)11.62 / 3.54
Firebox Area (sq ft / m2)54.92 / 5.10
Grate Area (sq ft / m2) 8.50 / 0.79
Evaporative Heating Surface (sq ft / m2)411 / 38.20
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)411 / 38.20
Evaporative Heating Surface/Cylinder Volume174.43
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1105
Same as above plus superheater percentage1105
Same as above but substitute firebox area for grate area7140
Power L12585
Power MT462.08

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