Sra Dolores Martinez Negrete 0-4-2 Locomotives in Mexico


Class Details by Steve Llanso of Sweat House Media

Class Dolores (Locobase 13238)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 31, p. 127. See also biography of Martfnez Negrete, Francisco (1797-1874), found at [], last accessed 11 October 2011. Works number was 32390 in December 1907.

Typical plantation tank from Baldwin. Locobase has found a Dolores Martinez Negrete of Bermejillo, "proprietaria" (proprietress) of the Hacienda Jesus Maria from whom land was bought in 1896. Hacienda Jesus Maria was located in San Luis Potosi.

Principal Dimensions by Steve Llanso of Middle Run Media

ClassDolores
Locobase ID13238
RailroadSra Dolores Martinez Negrete
CountryMexico
Whyte0-4-2T
Number in Class1
Road Numbers
GaugeStd
Number Built1
BuilderBurnham, Williams & Co
Year1907
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)5 / 1.52
Engine Wheelbase (ft / m)11.50 / 3.51
Ratio of driving wheelbase to overall engine wheelbase 0.43
Overall Wheelbase (engine & tender) (ft / m)11.50 / 3.51
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)30,000 / 13,608
Engine Weight (lbs / kg)40,000 / 18,144
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)40,000
Tender Water Capacity (gals / ML)450 / 1.70
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)25 / 12.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)38 / 965
Boiler Pressure (psi / kPa)150 / 10.30
High Pressure Cylinders (dia x stroke) (in / mm)10" x 16" / 254x406
Tractive Effort (lbs / kg)5368 / 2434.89
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.59
Heating Ability
Tubes (number - dia) (in / mm)96 - 1.5" / 38
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m) 7.99 / 2.44
Firebox Area (sq ft / m2)40.30 / 3.75
Grate Area (sq ft / m2) 8.80 / 0.82
Evaporative Heating Surface (sq ft / m2)338 / 31.41
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)338 / 31.41
Evaporative Heating Surface/Cylinder Volume233.10
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1320
Same as above plus superheater percentage1320
Same as above but substitute firebox area for grate area6045
Power L13535
Power MT519.56

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