Agua Santa Nitrate & Railroad 2-4-2 Locomotives in Chile


Class Details by Steve Llanso of Sweat House Media

Class 21 (Locobase 13996)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Vol 44, p. 198. Works numbers were 39067-39069 in January 1913.

Nineteen years after the ASN had bought its double-ender saddle tanks from Baldwin through broker Balfour Williamson, it took delivery of three more that were essentially identical except for having a higher boiler pressure and slightly greater weights.


Class unknown (Locobase 12013)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Vol 17, p. 181 and Vol 19, p. 91. Works numbers were 12398-12399 in January 1892,13995-13996 in April 1894, 14111-14115 in October, and 14236-14238 in March 1895.

This British-owned railway didn't balk at buying a pair of double-ender tanks for this key railway in Chile's northern province of Tarapaca, then repeating the orders over the next 3 years. Local dealer Balfour, Williamson bought 5 more originally ordered by Hemenway, Browne. These too went to the ASN as did 3 more in 1895.

Principal Dimensions by Steve Llanso of Middle Run Media
Class21unknown
Locobase ID13996 12013
RailroadAgua Santa Nitrate & RailroadAgua Santa Nitrate & Railroad
CountryChileChile
Whyte2-4-2ST2-4-2ST
Number in Class312
Road Numbers21-23
Gauge2'6"2'6"
Number Built312
BuilderBaldwinBurnham, Williams & Co
Year19131892
Valve GearStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)5 / 1.525 / 1.52
Engine Wheelbase (ft / m)18.17 / 5.5418.17 / 5.54
Ratio of driving wheelbase to overall engine wheelbase 0.28 0.28
Overall Wheelbase (engine & tender) (ft / m)18.17 / 5.5418.17 / 5.54
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)31,000 / 14,06130,000 / 13,608
Engine Weight (lbs / kg)47,000 / 21,31943,000 / 19,504
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)47,000 / 21,31943,000 / 19,504
Tender Water Capacity (gals / ML)500 / 1.89500 / 5.68
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)150 / 568
Minimum weight of rail (calculated) (lb/yd / kg/m)26 / 1325 / 12.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)37 / 94037 / 940
Boiler Pressure (psi / kPa)150 / 1030130 / 900
High Pressure Cylinders (dia x stroke) (in / mm)11" x 16" / 279x40611" x 16" / 279x406
Tractive Effort (lbs / kg)6671 / 3025.925782 / 2622.67
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.65 5.19
Heating Ability
Tubes (number - dia) (in / mm)96 - 1.5" / 3896 - 1.5" / 38
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)9 / 2.749 / 2.74
Firebox Area (sq ft / m2)39 / 3.6238 / 3.53
Grate Area (sq ft / m2) 8.70 / 0.81 8.70 / 0.81
Evaporative Heating Surface (sq ft / m2)375 / 34.85377 / 35.04
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)375 / 34.85377 / 35.04
Evaporative Heating Surface/Cylinder Volume213.08214.22
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation13051131
Same as above plus superheater percentage13051131
Same as above but substitute firebox area for grate area58504940
Power L129962583
Power MT426.13379.64

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