Itapura a Corumba 4-6-0 Locomotives in Brazil

Class Details by Steve Llanso of Sweat House Media

Class 21 (Locobase 14209)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 49, p.161. Works numbers were 40776-40779 in October 1913.

Although ordered by and nearly delivered to the Northeastern Railway of Brazil to the same design as their 1910 4-6-0s (Locobase 13976), the four Ten-wheelers of 1913 were sold instead to the I a C in Mato Grasso State west of Rio de Janeiro. It was a 604-mile (973-km) main line that was begun in 1908 and completed in 1914 with the connection with the Porto Experanca Railway.

The specs show wood-burning engines with Radley & Hunter balloon stacks, although the specs make provisions with a deep firebox and extra grates. They rolled on 40 lb/yard (20 kg/metre) rails and were tasked to take 85 metre/279 foot radii (20 1/2 degrees) at 10 mph (16 kmh) "and if possible 75 metre [246 feet] curves are to be provided for." Another goal was to limit the axle loading to 17,600 lb (7,983 kg).

According to Gene Connelly's comprehensive list of Baldwin production, three of the four were soon sold to the Madeira a Mamore in western Brazil.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID14209
RailroadItapura a Corumba
Number in Class4
Road Numbers21-24
Number Built4
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)10.75 / 3.28
Engine Wheelbase (ft / m)19.83 / 6.04
Ratio of driving wheelbase to overall engine wheelbase 0.54
Overall Wheelbase (engine & tender) (ft / m)43 / 13.11
Axle Loading (Maximum Weight per Axle) (lbs / kg)17,600 / 7983
Weight on Drivers (lbs / kg)59,000 / 26,762
Engine Weight (lbs / kg)75,800 / 34,382
Tender Loaded Weight (lbs / kg)52,000 / 23,587
Total Engine and Tender Weight (lbs / kg)127,800 / 57,969
Tender Water Capacity (gals / ML)2400 / 9.09
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)33 / 16.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)42 / 1067
Boiler Pressure (psi / kPa)170 / 11.70
High Pressure Cylinders (dia x stroke) (in / mm)15" x 18" / 381x457
Tractive Effort (lbs / kg)13,934 / 6320.36
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.23
Heating Ability
Tubes (number - dia) (in / mm)147 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)12.25 / 3.73
Firebox Area (sq ft / m2)86 / 7.99
Grate Area (sq ft / m2)14.60 / 1.36
Evaporative Heating Surface (sq ft / m2)1023 / 95.04
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1023 / 95.04
Evaporative Heating Surface/Cylinder Volume277.87
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2482
Same as above plus superheater percentage2482
Same as above but substitute firebox area for grate area14,620
Power L14697
Power MT526.53

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