Lautaro Nitrate 0-6-2 Locomotives in Chile


Class Details by Steve Llanso of Sweat House Media

Class 17 (Locobase 14518)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 54, p. 368.

Although it repeated most of the details of the earlier Lautaro tank shown in Locobase 12381, the 17 arrived with small changes in the firebox and a three-ton gain in weight. It tackled the 4% grades and curves of 100 metre (328 foot) radii.


Class 20 (Locobase 15189)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 66, p. 380. Works number was 51268 in February 1919.

Two years after the Lautaro took delivery of the 17 (Locobase 14518), the nitrate railway ordered another radial tank that had the same boiler and firebox, but significantly greater cylinder volume.


Class Lautaro (Locobase 12381)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 21, p 296. See also Jose ntonio Gonzalez-Pizarro, "Privatization Versus Public Funding on the Atacama Desert Railway v An Interpretation", archived at [link],%20Signalling%20and%20Security%20in%20Railway/Chapter%203%20%20Privatization%20Versus%20Public%20Funding%20on%20the%20Atacama%20Desert%20Railway-An%20Interpretation.pdf. Works number was 17341 in January 1900.

Principal Dimensions by Steve Llanso of Middle Run Media
Class1720Lautaro
Locobase ID14518 15189 12381
RailroadLautaro NitrateLautaro NitrateLautaro Nitrate
CountryChileChileChile
Whyte0-6-2T0-6-2T0-6-2T
Number in Class111
Road Numbers17207, 19
Gauge3'6"3'6"3'6"
Number Built111
BuilderBaldwinBaldwinBurnham, Williams & Co
Year191719181900
Valve GearStephensonStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 9.25 / 2.82 9.25 / 2.82 9.25 / 2.82
Engine Wheelbase (ft / m)15.25 / 4.6515.25 / 4.6515.25 / 4.65
Ratio of driving wheelbase to overall engine wheelbase 0.61 0.61 0.61
Overall Wheelbase (engine & tender) (ft / m)15.25 / 4.6515.25 / 4.6515.25 / 4.65
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)62,000 / 28,12362,000 / 28,12356,000 / 25,401
Engine Weight (lbs / kg)70,000 / 31,75270,000 / 31,75267,000 / 30,391
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)1200 / 4.551200 / 4.551000 / 3.79
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 1.25
Minimum weight of rail (calculated) (lb/yd / kg/m)34 / 1734 / 1731 / 15.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)37 / 94037 / 94037 / 940
Boiler Pressure (psi / kPa)160 / 1100160 / 1100160 / 1100
High Pressure Cylinders (dia x stroke) (in / mm)11" x 16" / 279x40613" x 20" / 279x40613" x 20" / 330x508
Tractive Effort (lbs / kg)7116 / 3227.7712,424 / 5635.4412,424 / 5635.44
Factor of Adhesion (Weight on Drivers/Tractive Effort) 8.71 4.99 4.51
Heating Ability
Tubes (number - dia) (in / mm)124 - 1.75" / 44124 - 1.75" / 44124 - 1.75" / 44
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)10 / 3.0510 / 3.0510 / 3.05
Firebox Area (sq ft / m2)58.20 / 5.4158.20 / 5.4158.11 / 5.40
Grate Area (sq ft / m2)11.30 / 1.0511.30 / 1.0511.16 / 1.04
Evaporative Heating Surface (sq ft / m2)627 / 58.25627 / 58.25626 / 58.18
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)627 / 58.25627 / 58.25626 / 58.18
Evaporative Heating Surface/Cylinder Volume356.28204.07203.74
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation180818081786
Same as above plus superheater percentage180818081786
Same as above but substitute firebox area for grate area931293129298
Power L1514729482943
Power MT549.06314.48347.58

All material Copyright © SteamLocomotive.com
Wes Barris