Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 66 p. 382. Works numbers were 47434-47435 in December 1917 and 52852-52853 in January 1920.
These were small, narrow-gauge Prairie tanks delivered in 1918. Two later engines built to the same specs were delivered as oil burners; see Locobase 20801.
Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 66 p. 384-385. Works numbers were 2852-52853 in January 1920.
Baldwin delivered the first pair of Prairie tanks in early 1918 equipped to burn soft coal; see Locobase 15190. When the Antofagasta ordered the second pair on 11 November 1919, they repeated the design, but switched to oil fuel. Baldwin's spec advised that the oil would have a gravity range of .9304 to .9792, which corresponded to 20 and 13 Baume, respectively. BLW mounted its standard burner on the front end of the fire box.
| Principal Dimensions by Steve Llanso of Middle Run Media | ||
|---|---|---|
| Class | 1 | 3 |
| Locobase ID | 15190 | 20801 |
| Railroad | Antofagasta (Chile ) & Bolivia (FCAB) | Antofagasta (Chile ) & Bolivia (FCAB) |
| Country | Chile | Chile |
| Whyte | 2-6-2T | 2-6-2T |
| Number in Class | 2 | 2 |
| Road Numbers | 1-2 | 3-4 |
| Gauge | Metre | Metre |
| Number Built | 2 | 2 |
| Builder | Baldwin | Baldwin |
| Year | 1917 | 1920 |
| Valve Gear | Stephenson | Stephenson |
| Locomotive Length and Weight | ||
| Driver Wheelbase (ft / m) | 9.75 / 2.97 | 9.75 / 2.97 |
| Engine Wheelbase (ft / m) | 22 / 6.71 | 22 / 6.71 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.44 | 0.44 |
| Overall Wheelbase (engine & tender) (ft / m) | 22 / 6.71 | 22 / 6.71 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | ||
| Weight on Drivers (lbs / kg) | 63,500 / 28,803 | 63,500 / 28,803 |
| Engine Weight (lbs / kg) | 85,000 / 38,555 | 85,000 / 38,555 |
| Tender Loaded Weight (lbs / kg) | ||
| Total Engine and Tender Weight (lbs / kg) | ||
| Tender Water Capacity (gals / ML) | 1200 / 4.55 | 1200 / 4.55 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 1.50 / 1 | 450 / 1703.30 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 35 / 17.50 | 35 / 17.50 |
| Geometry Relating to Tractive Effort | ||
| Driver Diameter (in / mm) | 44 / 1118 | 44 / 1118 |
| Boiler Pressure (psi / kPa) | 160 / 1100 | 160 / 1100 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 15" x 20" / 381x508 | 15" x 20" / 381x508 |
| Tractive Effort (lbs / kg) | 13,909 / 6309.02 | 13,909 / 6309.02 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.57 | 4.57 |
| Heating Ability | ||
| Tubes (number - dia) (in / mm) | 152 - 1.75" / 44 | 152 - 1.75" / 44 |
| Flues (number - dia) (in / mm) | ||
| Flue/Tube length (ft / m) | 9.17 / 2.80 | 9.17 / 2.80 |
| Firebox Area (sq ft / m2) | 74 / 6.87 | 74 / 6.87 |
| Grate Area (sq ft / m2) | 15 / 1.39 | 15 / 1.39 |
| Evaporative Heating Surface (sq ft / m2) | 706 / 65.59 | 706 / 65.59 |
| Superheating Surface (sq ft / m2) | ||
| Combined Heating Surface (sq ft / m2) | 706 / 65.59 | 706 / 65.59 |
| Evaporative Heating Surface/Cylinder Volume | 172.59 | 172.59 |
| Computations Relating to Power Output (More Information) | ||
| Robert LeMassena's Power Computation | 2400 | 2400 |
| Same as above plus superheater percentage | 2400 | 2400 |
| Same as above but substitute firebox area for grate area | 11,840 | 11,840 |
| Power L1 | 3086 | 3086 |
| Power MT | 321.42 | 321.42 |