Bahia 2-6-0 Locomotives in Brazil

Class Details by Steve Llanso of Sweat House Media

Class 9 (Locobase 11787)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 10, p. 204 Works number ?? 1881.

Locobase cannot match this Mogul up with an entry in Connelly's Baldwin production list. The spec sheet says it was originally built for the Madura & Mamore in 1878.

The order also contains an internal contradiction. The heating surface area given for the tubes doesn't match up with the area calculated for 190 1 1/2" (38 mm) tubes each 7' 8 1/4" (2.35 m) long; the difference is 62 sq ft (5.75 sq m). If, however, the diameter was 1 5/8" (41 mm), the tube heating surface area would work out to be 622 sq ft (57.79 sq m).

So Locobase figures that the area given in the specs was calculated using the tube's inside diameter (fire side) for a couple of reasons and uses instead the water side: 1) Adding 3 mm to a 38mm tube is a reasonable thickness for boiler tubes of so small a diameter, 2) It is a way to rationalize what would otherwise be a mistake in calculation of two very clearly stated components of a cylinder's area.

Since Locobase chooses to use the water side measure in virtually all of the 16,000+ Locobase entries largely for historical rather than demonstrated superiority, he adopts that convention. He also concedes that the argument for and against water side vs fire side was never actually settled.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID11787
Number in Class1
Road Numbers9
Number Built1
BuilderBurnham, Parry, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)12 / 3.66
Engine Wheelbase (ft / m)18 / 5.49
Ratio of driving wheelbase to overall engine wheelbase 0.67
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)
Engine Weight (lbs / kg)
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)1500 / 5.68
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)41 / 1041
Boiler Pressure (psi / kPa)130 / 9
High Pressure Cylinders (dia x stroke) (in / mm)14" x 18" / 356x457
Tractive Effort (lbs / kg)9508 / 4312.76
Factor of Adhesion (Weight on Drivers/Tractive Effort)
Heating Ability
Tubes (number - dia) (in / mm)190 - 1.625" / 41
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m) 7.69 / 2.34
Firebox Area (sq ft / m2)81 / 7.53
Grate Area (sq ft / m2)10 / 0.93
Evaporative Heating Surface (sq ft / m2)703 / 65.31
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)703 / 65.31
Evaporative Heating Surface/Cylinder Volume219.21
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1300
Same as above plus superheater percentage1300
Same as above but substitute firebox area for grate area10,530
Power L13069
Power MT

All material Copyright ©
Wes Barris