Usina Poto Gordo 2-6-0 Locomotives in Brazil

Class Details by Steve Llanso of Sweat House Media

Class Nilo (Locobase 15448)

Data from DeGolyer, Vol 72, pp. 163+ and Vol 79, pp. 280+. Works numbers were 58136

in December 1924 and 60819 in May 1929.

Adding the special character to the c in Poto Gordo brings out the real meaning of the phrase. Locobase thought it might translate as "chubby" (literally "little fat"?), but instead the name refers to a productive well of water. The plantation was in the district of Spo Sebastipo in Rio de Janeiro State, not far to the northeast of Porto Alegre.

These little wood-burning Ten-wheelers Rushton Improved spark-arresting cabbage stacks. The specs don't say much about the locomotives' operating conditions, noting only that minimum curve radii were 160 feet (48.8 m). They were expected to meet the requirements laid out by the much larger Leopoldina Railway.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID15448
RailroadUsina Poto Gordo
Number in Class2
Road Numbers
Number Built2
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)8 / 2.44
Engine Wheelbase (ft / m)13.83 / 4.22
Ratio of driving wheelbase to overall engine wheelbase 0.58
Overall Wheelbase (engine & tender) (ft / m)33.52 / 10.22
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)30,000 / 13,608
Engine Weight (lbs / kg)35,000 / 15,876
Tender Loaded Weight (lbs / kg)37,000 / 16,783
Total Engine and Tender Weight (lbs / kg)72,000 / 32,659
Tender Water Capacity (gals / ML)1500 / 5.68
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)17 / 8.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)33 / 838
Boiler Pressure (psi / kPa)170 / 11.70
High Pressure Cylinders (dia x stroke) (in / mm)10" x 16" / 254x406
Tractive Effort (lbs / kg)7006 / 3177.87
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.28
Heating Ability
Tubes (number - dia) (in / mm)78 - 1.75" / 44
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m) 7.58 / 2.31
Firebox Area (sq ft / m2)44 / 4.09
Grate Area (sq ft / m2) 9.10 / 0.85
Evaporative Heating Surface (sq ft / m2)312 / 28.99
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)312 / 28.99
Evaporative Heating Surface/Cylinder Volume214.52
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1547
Same as above plus superheater percentage1547
Same as above but substitute firebox area for grate area7480
Power L13420
Power MT753.98

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