Santo Amaro 4-6-0 Locomotives in Brazil

Class Details by Steve Llanso of Sweat House Media

Class 1 (Locobase 13489)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 32, p. 300, Vol 54, pp.349+, Vol 66, pp. 350. See also Frederic M Halsey, Investments in Latin America and the British West Indies, Special Agents Series - No 169, United States Department of Commerce (Washington, DC: Government Printing Office,1918) p. 160. Works numbers were 32946 in August 1908, 33439 in May 1909, 39538 in March 1913, 42399 in September 1915, and 52126 and 52139 in August 1919.

Special Agent Halsey conveys the 19 July 1917 report by Consul Edward Higgins, which he describes the Santo Amaro line built in Bahia state in Brazil's Northeast. It served what was described in 1917 as the "best sugar district of the State", ran 21 miles (34 km) from Santo Amaro to Jacu. It also had a short extension to Bom Jardin.

The 1913 order included details of a demanding operational environment:

Maximum grade reached more than 3% while curves arced at less than 100 metres (328 ft). The track was of "poor quality - spongy in wet weather", the water was "bad", driving springs were to be 50% heavier than on earlier engines. A testy note accompanied the list:"The following details were received from the customer and were specified on memo specification after locomotive was built and boxed ready for shipment." After this pre-emptive exculpation, the writer added "They are to be followed in building any locomotive hereafter."

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID13489
RailroadSanto Amaro
Number in Class6
Road Numbers1, 9, 6, 5, 12
Number Built6
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 9.67 / 2.95
Engine Wheelbase (ft / m)18.67 / 5.69
Ratio of driving wheelbase to overall engine wheelbase 0.52
Overall Wheelbase (engine & tender) (ft / m)42.12 / 12.84
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)48,000 / 21,772
Engine Weight (lbs / kg)62,000 / 28,123
Tender Loaded Weight (lbs / kg)44,000 / 19,958
Total Engine and Tender Weight (lbs / kg)106,000 / 48,081
Tender Water Capacity (gals / ML)2200 / 8.33
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)4 / 4
Minimum weight of rail (calculated) (lb/yd / kg/m)27 / 13.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)42 / 1067
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)14" x 18" / 356x457
Tractive Effort (lbs / kg)12,852 / 5829.58
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.73
Heating Ability
Tubes (number - dia) (in / mm)120 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)11.83 / 3.61
Firebox Area (sq ft / m2)67 / 6.22
Grate Area (sq ft / m2)12.50 / 1.16
Evaporative Heating Surface (sq ft / m2)805 / 74.79
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)805 / 74.79
Evaporative Heating Surface/Cylinder Volume251.01
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2250
Same as above plus superheater percentage2250
Same as above but substitute firebox area for grate area12,060
Power L14479
Power MT617.16

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Wes Barris