Dourado 2-6-0 Locomotives in Brazil


Class Details by Steve Llanso of Sweat House Media

Class 1 (Locobase 13011)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 44, p. 33. Works number was 33420 in May 1909.

Locobase 13006 shows us a relatively large Mogul for the 60-cm gauge. When the Dourado converted to metre-gauge running, they ordered a very similar wood-burner that was now in the middle of the pack. It too was a wood-burner, but with a smaller firebox.


Class 11 (Locobase 13012)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 44, p. p. 35. See also Data from builder's card reproduced at [link], supplemented by DeGolyer, Volume 66, pp. 305+. Works numbers were 37717 in May 1912 and 52940 in January 1920.

Designed to the same specs as the Mogul given the number 7 in 1906 (Locobase 13006), the 9 was every bit as big for the gauge as its earlier stablemate. However, it put more weight on the drivers for a more reasonable factor of adhesion. Eight years Baldwin delivered a stablemate.

The pair was late rebuilt to operate on the metre gauge and renumbered at that time. Sometime after that, the 15 was sold to the Paulista according to Gene Connelly's production list


Class 3 (Locobase 12501)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Vol 24, p. 2. Works number was 19064 in May 1901.

Baldwin used the dimensions of a small Mogul design that they had sold to US railroads in 1892 to fulfill this order in 1901. The one difference was a considerably higher boiler pressure. After some years in service, the engine was sold to the Usina Monte Alegre.

NB: Locobase estimates the evaporative and direct heating surface area by comparing the very similar Laurel River Mogul described in Locobase 12047. They had the same number of identical-diameter boiler tubes running the same length (less 1/2 inch), as well as grates and fireboxes that measured identically to the quarter-inch.


Class 7 / 4 (Locobase 13006)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 29, p. 161 and Vol 44, p. 41. Works number was 28997 in September 1906.

A large and relatively wood-burning Mogul for this very skinny gauge, the 7 was set a daunting task: to haul 90 tons up a 3% grade and curl around curves of only 50 metres (164 feet).

Principal Dimensions by Steve Llanso of Middle Run Media
Class11137 / 4
Locobase ID13011 13012 12501 13006
RailroadDouradoDouradoDouradoDourado
CountryBrazilBrazilBrazilBrazil
Whyte2-6-02-6-02-6-02-6-0
Number in Class1211
Road Numbers19, 11 / 14-1537
Gauge60 cm60 cm2'60 cm
Number Built1211
BuilderBaldwinBaldwinBurnham, Williams & CoBurnham, Williams & Co
Year1909191219011906
Valve GearStephensonWalschaertStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)7 / 2.137 / 2.137 / 2.137 / 2.13
Engine Wheelbase (ft / m)12.92 / 3.9412.92 / 3.9412.83 / 3.9112.92 / 3.94
Ratio of driving wheelbase to overall engine wheelbase 0.54 0.54 0.55 0.54
Overall Wheelbase (engine & tender) (ft / m)35.96 / 10.9635.96 / 10.96
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)49,000 / 22,22649,000 / 22,22635,000 / 15,87641,000 / 18,597
Engine Weight (lbs / kg)56,000 / 25,40156,000 / 25,40141,000 / 18,59750,000 / 22,680
Tender Loaded Weight (lbs / kg)27,000 / 12,24727,000 / 12,24725,000 / 11,34027,000 / 12,247
Total Engine and Tender Weight (lbs / kg)83,000 / 37,64883,000 / 37,64866,000 / 29,93777,000 / 34,927
Tender Water Capacity (gals / ML)1500 / 5.681500 / 5.681000 / 3.791500 / 5.68
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)27 / 13.5027 / 13.5019 / 9.5023 / 11.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)33 / 83833 / 83833 / 83833 / 838
Boiler Pressure (psi / kPa)180 / 1240180 / 1240180 / 1240180 / 1240
High Pressure Cylinders (dia x stroke) (in / mm)13" x 16" / 330x40613" x 16" / 330x40612" x 16" / 305x40613" x 16" / 330x406
Tractive Effort (lbs / kg)12,537 / 5686.6912,537 / 5686.6910,682 / 4845.2812,537 / 5686.69
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.91 3.91 3.28 3.27
Heating Ability
Tubes (number - dia) (in / mm)110 - 2" / 51110 - 2" / 5168 - 2" / 51110 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)10.75 / 3.2810.75 / 3.2810.79 / 3.2910.75 / 3.28
Firebox Area (sq ft / m2)50 / 4.6562 / 5.7644.50 / 4.1462 / 5.76
Grate Area (sq ft / m2)10.30 / 0.9610.30 / 0.96 7.60 / 0.7110.30 / 0.96
Evaporative Heating Surface (sq ft / m2)664 / 61.71676 / 62.83423 / 39.31676 / 62.83
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)664 / 61.71676 / 62.83423 / 39.31676 / 62.83
Evaporative Heating Surface/Cylinder Volume270.14275.02201.97275.02
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1854185413681854
Same as above plus superheater percentage1854185413681854
Same as above but substitute firebox area for grate area900011,160801011,160
Power L13681397130513971
Power MT496.85535.99576.54640.58

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