San Ildefonso 2-4-4 Locomotives in Mexico


Class Details by Steve Llanso of Sweat House Media

Class 1 (Locobase 11494)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Vol 26, p. 266. Works numbers 16432-16433 in December 1898 and 23905, 23967 in March 1904, and 29276 in October 1906.

All of this design sold to this railroad were lettered for the Monte Alto y Tlalnepantla, only the 5th engine is unambiguously numbered.. Locobase cannot determine what road numbers might actually have been borne by which of the first 4 locomotives.

Principal Dimensions by Steve Llanso of Middle Run Media
Class1
Locobase ID11494
RailroadSan Ildefonso
CountryMexico
Whyte2-4-4T
Number in Class5
Road Numbers1-2 and 1-2, 3
Gauge3'
Number Built5
BuilderBurnham, Williams & Co
Year1898
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)6 / 1.83
Engine Wheelbase (ft / m)25.67 / 7.82
Ratio of driving wheelbase to overall engine wheelbase 0.23
Overall Wheelbase (engine & tender) (ft / m)25.67 / 7.82
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)45,000 / 20,412
Engine Weight (lbs / kg)71,000 / 32,205
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)800 / 3.03
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)38 / 19
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)40 / 1016
Boiler Pressure (psi / kPa)150 / 1030
High Pressure Cylinders (dia x stroke) (in / mm)14" x 20" / 356x508
Tractive Effort (lbs / kg)12,495 / 5667.64
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.60
Heating Ability
Tubes (number - dia) (in / mm)118 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)10.04 / 3.06
Firebox Area (sq ft / m2)75 / 6.97
Grate Area (sq ft / m2) 9.50 / 0.88
Evaporative Heating Surface (sq ft / m2)688 / 63.94
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)688 / 63.94
Evaporative Heating Surface/Cylinder Volume193.26
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1425
Same as above plus superheater percentage1425
Same as above but substitute firebox area for grate area11,250
Power L12986
Power MT292.58

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