Descubridora Mining & Smelting 2-8-0 Locomotives in Mexico

Class Details by Steve Llanso of Sweat House Media

Class 102 (Locobase 12686)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Vol 25, p.297. Works number was 22479 in July 1903.

Camelback designs often were used to provide the enormous grate used to burn anthracite culm. In the case of this single Consolidation, the fuel was "Poor coal, 20 to 24 per cent ash.", a low-calorie source that had similar requirements - light draft and thin bed. Hence the use of the big firebox. Some time later, the Durango Central herald was applied to the tender; Locobase doesn't know if it was a sale or the result of a consolidation of railways.

DM&S extracted copper ore in decreasing quantities in the first decade of the 1900s.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID12686
RailroadDescubridora Mining & Smelting
Number in Class1
Road Numbers102
Number Built1
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)13.58 / 4.14
Engine Wheelbase (ft / m)21.58 / 6.58
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)130,000 / 58,967
Engine Weight (lbs / kg)145,000 / 65,771
Tender Loaded Weight (lbs / kg)120,000 / 54,431
Total Engine and Tender Weight (lbs / kg)265,000 / 120,202
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)54 / 27
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)50 / 1270
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)21" x 26" / 533x660
Tractive Effort (lbs / kg)35,086 / 15914.76
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.71
Heating Ability
Tubes (number - dia) (in / mm)300 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)13.15 / 4.01
Firebox Area (sq ft / m2)176.25 / 16.38
Grate Area (sq ft / m2)78 / 7.25
Evaporative Heating Surface (sq ft / m2)2228 / 207.06
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)2228 / 207.06
Evaporative Heating Surface/Cylinder Volume213.82
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation14,040
Same as above plus superheater percentage14,040
Same as above but substitute firebox area for grate area31,725
Power L14476
Power MT303.63

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