Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 44, p.221-224. Works numbers were 33538-33541 om July 1911.
The specs give a clue as to why this set of Eight-wheelers was so small for a standard-gauge railway: the rail weight was given as "15 kg per metre [30 ft/yard] and heavier". The engines were to be run forward and backward, although they had tenders. The result was an exceptionally light locomotive, one of the smallest ever to operate on the 4 ft, 8 1/2 inch gauge.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 27 |
| Locobase ID | 13245 |
| Railroad | Buenos Ayres Central (FCCBA) |
| Country | Argentina |
| Whyte | 4-4-0 |
| Number in Class | 1 |
| Road Numbers | 27-30 |
| Gauge | Std |
| Number Built | 1 |
| Builder | Baldwin |
| Year | 1909 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 6.50 / 1.98 |
| Engine Wheelbase (ft / m) | 19.08 / 5.82 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.34 |
| Overall Wheelbase (engine & tender) (ft / m) | 39.62 / 12.08 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 31,000 / 14,061 |
| Engine Weight (lbs / kg) | 50,000 / 22,680 |
| Tender Loaded Weight (lbs / kg) | 52,500 / 23,814 |
| Total Engine and Tender Weight (lbs / kg) | 102,500 / 46,494 |
| Tender Water Capacity (gals / ML) | 2100 / 7.95 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 3 / 3 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 26 / 13 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 56 / 1422 |
| Boiler Pressure (psi / kPa) | 160 / 1100 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 12" x 22" / 432x559 |
| Tractive Effort (lbs / kg) | 7694 / 3489.94 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.03 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 94 - 2" / 51 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 9.37 / 2.86 |
| Firebox Area (sq ft / m2) | 63.50 / 5.90 |
| Grate Area (sq ft / m2) | 12 / 1.11 |
| Evaporative Heating Surface (sq ft / m2) | 521 / 48.40 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 521 / 48.40 |
| Evaporative Heating Surface/Cylinder Volume | 180.92 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 1920 |
| Same as above plus superheater percentage | 1920 |
| Same as above but substitute firebox area for grate area | 10,160 |
| Power L1 | 4348 |
| Power MT | 618.43 |