Carbonifero de Coahuila 2-8-0 Locomotives in Mexico

Class Details by Steve Llanso of Sweat House Media

Class 3 (Locobase 13634)

Data from DBaldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 27, p. 97. Works number was 24787 in November 1904.

One of the few Mexican camelbacks and probably the biggest. This engine was built for Conquista Coal & Coke, a subsidiary of Mexican Coal & Coke.Adopting the characteristic wide firebox was not because of the railroad's anthracite holdings, but rather to get more use out of the low-calorie coal that burned most completely in a soft draft.

Apparently not satisfactory, the 3 was sold in 1906 to the Internacional Mexicano as their #91. The IM in turn was taken over the Nacional de Mexico by 1911, at which point the 91 was renumbered to 570. 570 was retired in December 1923.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID13634
RailroadCarbonifero de Coahuila
Number in Class2
Road Numbers3
Number Built2
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)14.50 / 4.42
Engine Wheelbase (ft / m)23 / 7.01
Ratio of driving wheelbase to overall engine wheelbase 0.63
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)180,000 / 81,647
Engine Weight (lbs / kg)198,000 / 89,811
Tender Loaded Weight (lbs / kg)120,000 / 54,431
Total Engine and Tender Weight (lbs / kg)318,000 / 144,242
Tender Water Capacity (gals / ML)6000 / 22.73
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)75 / 37.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)48 / 1219
Boiler Pressure (psi / kPa)200 / 13.80
High Pressure Cylinders (dia x stroke) (in / mm)21" x 26" / 533x660
Tractive Effort (lbs / kg)40,609 / 18419.95
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.43
Heating Ability
Tubes (number - dia) (in / mm)345 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)15 / 4.57
Firebox Area (sq ft / m2)198.60 / 18.45
Grate Area (sq ft / m2)76 / 7.06
Evaporative Heating Surface (sq ft / m2)2893 / 268.77
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)2893 / 268.77
Evaporative Heating Surface/Cylinder Volume277.64
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation15,200
Same as above plus superheater percentage15,200
Same as above but substitute firebox area for grate area39,720
Power L15967
Power MT292.33

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