Usina Junqueira 2-6-2 Locomotives in Brazil


Class Details by Steve Llanso of Sweat House Media

Class Maria Theodora (Locobase 15449)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Vol 79, pp. 282+. See also "E F Junqueira" archived at [] . Works number was 60070 in June 1927.

Even now preserved for display and adorned with its copper-top stack, this plantation Prairie tank served this sugar mill for decades. The mill was located in the northern part of Sao Paulo State, some 450 km (280 miles) from the capital. The railway measured only 3.858 km (2.4 miles).

Principal Dimensions by Steve Llanso of Middle Run Media

ClassMaria Theodora
Locobase ID15449
RailroadUsina Junqueira
CountryBrazil
Whyte2-6-2T
Number in Class1
Road Numbers5
GaugeMetre
Number Built1
BuilderBaldwin
Year1927
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)9 / 2.74
Engine Wheelbase (ft / m)21.33 / 6.50
Ratio of driving wheelbase to overall engine wheelbase 0.42
Overall Wheelbase (engine & tender) (ft / m)21.33 / 6.50
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)55,000 / 24,948
Engine Weight (lbs / kg)77,000 / 34,927
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)77,000 / 34,927
Tender Water Capacity (gals / ML)900 / 3.41
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)31 / 15.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)40 / 1016
Boiler Pressure (psi / kPa)170 / 11.70
High Pressure Cylinders (dia x stroke) (in / mm)14" x 18" / 356x457
Tractive Effort (lbs / kg)12,745 / 5781.04
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.32
Heating Ability
Tubes (number - dia) (in / mm)140 - 1.75" / 44
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m) 8.50 / 2.59
Firebox Area (sq ft / m2)66 / 6.13
Grate Area (sq ft / m2)11.60 / 1.08
Evaporative Heating Surface (sq ft / m2)606 / 56.30
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)606 / 56.30
Evaporative Heating Surface/Cylinder Volume188.96
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1972
Same as above plus superheater percentage1972
Same as above but substitute firebox area for grate area11,220
Power L13308
Power MT397.79

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