Rio Grande do Sul 4-6-2 Locomotives in Brazil


Class Details by Steve Llanso of Sweat House Media

Class 11 (Locobase 21126)

Data from Alco class 462 S 127 Order C-637 builder's card supplied in February 2023 by Teemu Koivumaki..Works numbers were 62420, 62503-62505 in November 1920.

Brokers Carlos Barbosa and Alfredo Chaves ordered this quartet of relatively big and powerful Pacifics from the longer-lived Paterson, NJ subsidiary of the American Locomotive Company. By this time, a wood-burning grate was rare in new locomotives; this group's tenders carried 3 1/2 cords.

Principal Dimensions by Steve Llanso of Sweat House Media

Class11
Locobase ID21126
RailroadRio Grande do Sul
CountryBrazil
Whyte4-6-2
Number in Class4
Road Numbers11-14
GaugeMetre
Number Built4
BuilderAlco-Cooke
Year1920
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m) 9.50 / 2.90
Engine Wheelbase (ft / m)26.50 / 8.08
Ratio of driving wheelbase to overall engine wheelbase 0.36
Overall Wheelbase (engine & tender) (ft / m)52.06 / 15.87
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)90,500 / 41,050
Engine Weight (lbs / kg)135,000 / 61,235
Tender Loaded Weight (lbs / kg)87,000 / 39,463
Total Engine and Tender Weight (lbs / kg)222,000 / 100,698
Tender Water Capacity (gals / ML)4000 / 15.15
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)50 / 25
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)54 / 1372
Boiler Pressure (psi / kPa)170 / 11.70
High Pressure Cylinders (dia x stroke) (in / mm)19" x 26" / 483x660
Tractive Effort (lbs / kg)25,116 / 11392.44
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.60
Heating Ability
Tubes (number - dia) (in / mm)120 - 2" / 51
Flues (number - dia) (in / mm)21 - 5.375" / 137
Flue/Tube length (ft / m)15.75 / 4.80
Firebox Area (sq ft / m2)106 / 9.85
Grate Area (sq ft / m2)27.80 / 2.58
Evaporative Heating Surface (sq ft / m2)1553 / 144.28
Superheating Surface (sq ft / m2)395 / 36.70
Combined Heating Surface (sq ft / m2)1948 / 180.98
Evaporative Heating Surface/Cylinder Volume182.02
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation4726
Same as above plus superheater percentage5671
Same as above but substitute firebox area for grate area21,624
Power L110,110
Power MT738.85

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