Minas de Carvao no Jabuhy 4-6-0 Locomotives in Brazil

Class Details by Steve Llanso of Sweat House Media

Class 49 (Locobase 15140)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 66, pp. 303+. see also W W Ewing, "Construction Materials and Machinery in Brazil," Special Agents Series No 192, Department of Commerce, Bureau of Foreign and Domestic Commerce (Washington, DC: Government Printing Office, 1920), p. 18. Works numbers were 52815-52816 in January 1920.

Brazilian coal had a relatively low caloric value, so fitting a relatively large firebox to this small boiler seems a reasonable solution. Ewing reported that the railway covered 35 miles (56 km) between the coal mines worked by these two companies (Carvao Rio Grandense and Jacuhy were separate mines that shared the same operating company and board of directors) and the port on the Jacuhy river in Rio De Janeiro State. Jacuhy laid claim to 61.4 sq m of (159 sq km) coal land while Rio Grandense had 17.4 sq m (45.1 sq km) available. The reserve was estimated in 1920 at 75,000,000 short tons (approx. 68,182,000 metric tons),, but Ewing felt obliged to comment that "As yet, no steady development is in progress."

Principal Dimensions by Steve Llanso of Middle Run Media

Locobase ID15140
RailroadMinas de Carvao no Jabuhy
Number in Class3
Road Numbers49-51, 60-61
Number Built3
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 9.50 / 2.90
Engine Wheelbase (ft / m)17.67 / 5.39
Ratio of driving wheelbase to overall engine wheelbase 0.54
Overall Wheelbase (engine & tender) (ft / m)38.46 / 11.72
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)38,800 / 17,599
Engine Weight (lbs / kg)52,300 / 23,723
Tender Loaded Weight (lbs / kg)40,000 / 18,144
Total Engine and Tender Weight (lbs / kg)92,300 / 41,867
Tender Water Capacity (gals / ML)1800 / 6.82
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)3 / 3
Minimum weight of rail (calculated) (lb/yd / kg/m)22 / 11
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)42 / 1067
Boiler Pressure (psi / kPa)160 / 11
High Pressure Cylinders (dia x stroke) (in / mm)12" x 18" / 305x457
Tractive Effort (lbs / kg)8393 / 3807.01
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.62
Heating Ability
Tubes (number - dia) (in / mm)109 - 1.75" / 44
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m) 9.67 / 2.95
Firebox Area (sq ft / m2)61 / 5.67
Grate Area (sq ft / m2)11.90 / 1.11
Evaporative Heating Surface (sq ft / m2)540 / 50.17
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)540 / 50.17
Evaporative Heating Surface/Cylinder Volume229.18
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1904
Same as above plus superheater percentage1904
Same as above but substitute firebox area for grate area9760
Power L14017
Power MT684.74

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