Data from "Antofagasta (Chili) And Bolivia Railway, Metre Gauge, Sixteen 4-8-2 Type Locomotives," Vulcan Foundry Company Magazines, Vol 3, No. 3 (Autumn 1954), pp. 16-18. See also Martin Coombs, Chilean steam locomotive list, Part 3-Metre Gauge (March 2022), downloaded [], p. 165.Works numbers were 6166-6181 in 1954.
Oil-burning and fitted with Belpaire fireboxes, this class of Mountains were designed to negotiate curves with radii as small as 75 metres (246 feet). Ten of the engines went to the Bolivian section, six to the Chilean section.
NB: Tube length is an estimate based on the calculated tube and flue heating surface areas and a further calculation using the known counts and diameters of the two sizes of flues.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 201/206 |
| Locobase ID | 14478 |
| Railroad | Antofagasta (FCAB) |
| Country | Chile |
| Whyte | 4-8-2 |
| Number in Class | 6 |
| Road Numbers | 201-206 |
| Gauge | Metre |
| Number Built | 6 |
| Builder | Vulcan Foundry |
| Year | 1954 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 13.50 / 4.11 |
| Engine Wheelbase (ft / m) | 32 / 9.75 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.42 |
| Overall Wheelbase (engine & tender) (ft / m) | 59.04 / 18 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 33,688 / 15,281 |
| Weight on Drivers (lbs / kg) | 133,560 / 60,582 |
| Engine Weight (lbs / kg) | 197,344 / 89,514 |
| Tender Loaded Weight (lbs / kg) | 130,032 / 58,982 |
| Total Engine and Tender Weight (lbs / kg) | 327,376 / 148,496 |
| Tender Water Capacity (gals / ML) | 7200 / 27.27 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 2160.50 / 8177.50 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 56 / 28 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 48 / 1219 |
| Boiler Pressure (psi / kPa) | 200 / 1360 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 19" x 26" / 483x660 |
| Tractive Effort (lbs / kg) | 33,242 / 15078.34 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.02 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 130 - 2.25" / 57 |
| Flues (number - dia) (in / mm) | 28 - 5.5" / 140 |
| Flue/Tube length (ft / m) | 16.50 / 5.03 |
| Firebox Area (sq ft / m2) | 180 / 16.72 |
| Grate Area (sq ft / m2) | 39 / 3.62 |
| Evaporative Heating Surface (sq ft / m2) | 2110 / 196.03 |
| Superheating Surface (sq ft / m2) | 457 / 42.46 |
| Combined Heating Surface (sq ft / m2) | 2567 / 238.49 |
| Evaporative Heating Surface/Cylinder Volume | 247.30 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 7800 |
| Same as above plus superheater percentage | 9204 |
| Same as above but substitute firebox area for grate area | 42,480 |
| Power L1 | 13,358 |
| Power MT | 881.98 |