Cantagallo 2-6-0 Locomotives in Brazil

Class Details by Steve Llanso of Sweat House Media

Class Rocha Leao (Locobase 20748)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 13, p. 226. (Thanks to Teemu Koivumaki for his 14 June 2020 email noting this additional Cantagallo Mogule.) Works number was 8497 in April 1887.

Koivumaki's observation that there was another Cantagallo 2-6-0 in the Baldwin specifications series set Locobase on a search for sufficient data to enter the locomotive into the database. At the time these specifications were written in 1887, the person entering the order seldom entered the company's calculation of heatiing surface area. It's possible to extract the tube heating surface value, but figuring the firebox heating surface area is hard. Better to find a similar Baldwin engine of a later vintage with firebox dimensions closely matching (i.e. to the 1/4" or 1/2") the subject engine that has the data filled in.

Locobase found that match in the 1904 locomotives described in Locobase 12702. They too are Brazilian, running on the same gauge, identical in all dimensions. That entry served as the basis for this one.

Principal Dimensions by Steve Llanso of Sweat House Media

ClassRocha Leao
Locobase ID20748
Number in Class1
Road Numbers1
Number Built1
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 9.67 / 2.95
Engine Wheelbase (ft / m)15.75 / 4.80
Ratio of driving wheelbase to overall engine wheelbase 0.61
Overall Wheelbase (engine & tender) (ft / m)37.50 / 11.43
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)42,000 / 19,051
Engine Weight (lbs / kg)50,000 / 22,680
Tender Loaded Weight (lbs / kg)46,000 / 20,865
Total Engine and Tender Weight (lbs / kg)96,000 / 43,545
Tender Water Capacity (gals / ML)2200 / 8.33
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)23 / 11.50
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)14" x 18" / 356x457
Tractive Effort (lbs / kg)11,424 / 5181.85
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.68
Heating Ability
Tubes (number - dia) (in / mm)142 - 1.75" / 44
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m) 8.62 / 2.63
Firebox Area (sq ft / m2)72 / 6.69
Grate Area (sq ft / m2)12.60 / 1.17
Evaporative Heating Surface (sq ft / m2)626 / 58.16
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)626 / 58.16
Evaporative Heating Surface/Cylinder Volume195.20
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2016
Same as above plus superheater percentage2016
Same as above but substitute firebox area for grate area11,520
Power L13443
Power MT542.18

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