Companhia de Navegatnpo Estrada de Ferro Mauá 2-2-2 Locomotives in Brazil

Class Details by Steve Llanso of Sweat House Media

Class Baroneza (Locobase 20341)

Data from diagram presented on the Centro-Oeste website at []; and "Maua also was an integration pioneer" at [], last accessed 28 Janauray 2018.

The Baroneza earned a railway first when it pulled the inaugural train on 30 April 1854. The run covered 14.5 km to Raiz da Serra da Estrela (later named Vil Ihomirim). The engine was named after the wife of visionary engineer Irineu Evangelista de Souza then Barao (Baron) de Maua.

The Centro Oeste account notes that this locomotive never served on a State-owned line as it was retired by the EF Maua in 1870 when the railway adopted the metre gauge. Fortunately for Brazilian railway history, however, the Maua offered the Baroneza (modern Baronesa) to the imperial government, which preserved it as a "living monument" (monumento vivo). In the 21st century, the locomotive was on display at the Engenho de Dentro railway museum in Rio de Janeiro. Although the locomotive does not operate, its whistle was blown in 2002 to celebrate the 150th anniversary of the establishment of the first Brazilian railway.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID20341
RailroadCompanhia de Navegatnpo Estrada de Ferro Mauá
Number in Class1
Road Numbers1
Number Built1
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)
Engine Wheelbase (ft / m)18.57 / 5.66
Ratio of driving wheelbase to overall engine wheelbase
Overall Wheelbase (engine & tender) (ft / m)18.57 / 5.66
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)
Engine Weight (lbs / kg)30,865 / 14,000
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)1294 / 4.90
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 0.90 / 1
Minimum weight of rail (calculated) (lb/yd / kg/m)
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)59.10 / 1500
Boiler Pressure (psi / kPa)121.80 / 8.40
High Pressure Cylinders (dia x stroke) (in / mm)10.98" x 13.03" / 279x331
Tractive Effort (lbs / kg)2752 / 1248.29
Factor of Adhesion (Weight on Drivers/Tractive Effort)
Heating Ability
Tubes (number - dia) (in / mm)159 - 2.008" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)11.15 / 3.40
Firebox Area (sq ft / m2)30.14 / 2.80
Grate Area (sq ft / m2)15.07 / 1.40
Evaporative Heating Surface (sq ft / m2)331 / 30.73
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)331 / 30.73
Evaporative Heating Surface/Cylinder Volume231.79
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1836
Same as above plus superheater percentage1836
Same as above but substitute firebox area for grate area3671
Power L14047
Power MT

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