Agricola del Tlahualilo 0-4-4 Locomotives in Mexico

Class Details by Steve Llanso of Sweat House Media

Class 3 (Locobase 11480)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Vol 26, p. 24. Works numbers were 22686-22687 in August 1903. See also Lourdes Romero Navarete, El Rio Nazas y los derechos de agua en Mexico: conflicto y negociacion en el torno de la democracia, 1878-1939 (Hidalgo y Matamoros: Centro de Investigacion y Estudios Superiores en Antropologia Social, 2007), pp. 68-71 et seq.

Tlahualilo de Zaragoza is located due south of Texas's Big Bend and in the same latitude as the national border where it meets the Gulf. One of the key manmade features of this desert region was an irrigation canal that diverted water to its cotton fields. The CAT was founded in 1885 in the state of Durango and eventually oversaw the cultivation of 44,000 hectares (105,000+ acres) of cotton. Its output came to only slightly less than half of all the raw cotton consumed nationally by Mexican textile mills.

The locomotive was to be painted olive brown and aluminum and the tank was lettered "T y O de D".

Principal Dimensions by Steve Llanso of Middle Run Media

Locobase ID11480
RailroadAgricola del Tlahualilo
Number in Class2
Road Numbers3-4
Gauge60 cm
Number Built2
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 3.67 / 1.12
Engine Wheelbase (ft / m)11.75 / 3.58
Ratio of driving wheelbase to overall engine wheelbase 0.31
Overall Wheelbase (engine & tender) (ft / m)11.75 / 3.58
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)12,000 / 5443
Engine Weight (lbs / kg)21,000 / 9525
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)21,000
Tender Water Capacity (gals / ML)500 / 1.89
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)10 / 5
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)26 / 660
Boiler Pressure (psi / kPa)150 / 10.30
High Pressure Cylinders (dia x stroke) (in / mm)7" x 12" / 178x305
Tractive Effort (lbs / kg)2883 / 1307.71
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.16
Heating Ability
Tubes (number - dia) (in / mm)46 - 1.5" / 38
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m) 6.17 / 1.88
Firebox Area (sq ft / m2)20.10 / 1.87
Grate Area (sq ft / m2) 3.70 / 0.34
Evaporative Heating Surface (sq ft / m2)130 / 12.08
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)130 / 12.08
Evaporative Heating Surface/Cylinder Volume245.28
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation555
Same as above plus superheater percentage555
Same as above but substitute firebox area for grate area3015
Power L12827
Power MT1038.74

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