Sudoeste da Bahia 4-6-2 Locomotives in Brazil


Class Details by Steve Llanso of Sweat House Media

Class 25 (Locobase 15439)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Vol 79, p.218. Works numbers were 59611-59613 in October 1926.

Rolling on 42.23 lb/yard (21 kg/metre) rail, these wood-burning Pacifics pulled the SOe of Bahia's passenger trains. Endowed with a useful degree of superheat, the engines admitted this hotter steam to the cylinders through 8" (203 mm) piston valves. Locobase wonders if the class was operated at a lower boiler pressure than specified or if the engines' adhesion weight increased substantially in service.

They later operated on the EF de Nazareth, which was owned by the CV de Sudoeste de Bahia.

Principal Dimensions by Steve Llanso of Middle Run Media
Class25
Locobase ID15439
RailroadSudoeste da Bahia
CountryBrazil
Whyte4-6-2
Number in Class3
Road Numbers25-27
GaugeMetre
Number Built3
BuilderBaldwin
Year1925
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m) 9.50 / 2.90
Engine Wheelbase (ft / m)27.17 / 8.28
Ratio of driving wheelbase to overall engine wheelbase 0.35
Overall Wheelbase (engine & tender) (ft / m)50.17 / 15.29
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)66,000 / 29,937
Engine Weight (lbs / kg)109,000 / 49,442
Tender Loaded Weight (lbs / kg)66,000 / 29,937
Total Engine and Tender Weight (lbs / kg)175,000 / 79,379
Tender Water Capacity (gals / ML)3170 / 12.01
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)37 / 18.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)50 / 1270
Boiler Pressure (psi / kPa)180 / 1240
High Pressure Cylinders (dia x stroke) (in / mm)17" x 22" / 432x559
Tractive Effort (lbs / kg)19,455 / 8824.65
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.39
Heating Ability
Tubes (number - dia) (in / mm)107 - 2" / 51
Flues (number - dia) (in / mm)18 - 5.375" / 137
Flue/Tube length (ft / m)16 / 4.88
Firebox Area (sq ft / m2)102 / 9.48
Grate Area (sq ft / m2)24.90 / 2.31
Evaporative Heating Surface (sq ft / m2)1397 / 129.78
Superheating Surface (sq ft / m2)345 / 32.05
Combined Heating Surface (sq ft / m2)1742 / 161.83
Evaporative Heating Surface/Cylinder Volume241.71
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation4482
Same as above plus superheater percentage5378
Same as above but substitute firebox area for grate area22,032
Power L113,008
Power MT1303.53

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