Paulista 2-10-2 Locomotives in Brazil


Class Details by Steve Llanso of Sweat House Media

Class 91/760 (Locobase 15123)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 66, pp. 258+. See also Roy V Wright (Ed.), Locomotive Cyclopedia - 6th Edition (New York: Simmons-Boardman, 1922), p. 1015; "New Meter Gage [sic] Locomotives for South America, Railway Age, Volume 67, No 20 (12 November 1920), pp. 839-841; and Eduardo Jose de Jesus Coelho, Brazilian articulated steam locomotives (Memoria do Trem, 2003), p. 28. (Thanks to Teemu Koivumaki whose 2023 email included a comprehensive spreadsheet of Brazilian steam locomotive builders, works numbers, and owners.) Works numbers were 53061in February 1919, 53065-53069 in March.

This was the biggest metre-gauge locomotive operating in South America at the time of its introduction and were the very first 2-10-2s to operate South America. Steam entered the cylinders through 10" (254 mm) piston valves. The firebox could burn coal or wood and the engines were delivered with removable plates in the grate. Only the front pair of drivers turned in Franklin lateral motion boxes.

Coelho wrote that this sextet opened a period in which the Paulista and other Brazilian roads preferred large non-articulated locomotives because they could run at higher speeds and burned coal more economically. They tackled 2% grades and traveled around curve radii of 394 feet (120.1 metres).

Principal Dimensions by Steve Llanso of Middle Run Media
Class91/760
Locobase ID15123
RailroadPaulista
CountryBrazil
Whyte2-10-2
Number in Class6
Road Numbers91-96/760-765
GaugeMetre
Number Built6
BuilderBaldwin
Year1920
Valve GearSouthern
Locomotive Length and Weight
Driver Wheelbase (ft / m)15.83 / 4.82
Engine Wheelbase (ft / m)30.33 / 9.24
Ratio of driving wheelbase to overall engine wheelbase 0.52
Overall Wheelbase (engine & tender) (ft / m)57.42 / 17.50
Axle Loading (Maximum Weight per Axle) (lbs / kg)26,455 / 12,000
Weight on Drivers (lbs / kg)130,000 / 58,967
Engine Weight (lbs / kg)164,500 / 74,616
Tender Loaded Weight (lbs / kg)91,500 / 41,504
Total Engine and Tender Weight (lbs / kg)256,000 / 116,120
Tender Water Capacity (gals / ML)4500 / 17.05
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)8 / 7
Minimum weight of rail (calculated) (lb/yd / kg/m)43 / 21.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)42 / 1067
Boiler Pressure (psi / kPa)190 / 1310
High Pressure Cylinders (dia x stroke) (in / mm)20" x 22" / 508x559
Tractive Effort (lbs / kg)33,838 / 15348.68
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.84
Heating Ability
Tubes (number - dia) (in / mm)129 - 2" / 51
Flues (number - dia) (in / mm)22 - 5.375" / 137
Flue/Tube length (ft / m)19.08 / 5.82
Firebox Area (sq ft / m2)129 / 11.98
Grate Area (sq ft / m2)40 / 3.72
Evaporative Heating Surface (sq ft / m2)2000 / 185.80
Superheating Surface (sq ft / m2)500 / 46.45
Combined Heating Surface (sq ft / m2)2500 / 232.25
Evaporative Heating Surface/Cylinder Volume250.02
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation7600
Same as above plus superheater percentage9120
Same as above but substitute firebox area for grate area29,412
Power L111,879
Power MT1007.26

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