Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 49, p. 75. See also Cesar J Ayala, American sugar kingdom: the plantation economy of the Spanish Caribbean 1898-1934 (University of North Carolina Press, 1999), p. 144. (Thanks to Ivo Rutishauser for his 10 February 2026 email untangling a series of Baldwin specification pages.) Works number was 37169 in November 1911.
The Central Vannina was incorporated by Vannina Central Inc in 1911 to serve plantations and a mill in the Rio Piedras region of Puerto Rico. Linked by a 12 km (7.5 mile) line to Guaynabo, the mill was rated at startup as capable of processing 600 tons of cane per day. Along with the charter came a revocable permit to draw 200 litres (53 US gallons) per second from the Rio Piedras.
As metre-gauge radial tanks went, the Guaynabo was of middling size and power. Burning soft coal as its usual fuel meant the 4 used an 11" (279 mm) diameter Radley & Hunter spark-arresting stack.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | Guaynabo |
| Locobase ID | 14180 |
| Railroad | Central Vannina |
| Country | USA-Puerto Rico |
| Whyte | 0-6-2T |
| Number in Class | 1 |
| Road Numbers | 4 |
| Gauge | Metre |
| Number Built | 1 |
| Builder | Baldwin |
| Year | 1911 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 7.33 / 2.23 |
| Engine Wheelbase (ft / m) | 14.43 / 4.40 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.51 |
| Overall Wheelbase (engine & tender) (ft / m) | 14.43 / 4.40 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 40,000 / 18,144 |
| Engine Weight (lbs / kg) | 46,000 / 20,865 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | 500 / 1.89 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 22 / 11 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 33 / 838 |
| Boiler Pressure (psi / kPa) | 160 / 1100 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 11" x 16" / 279x406 |
| Tractive Effort (lbs / kg) | 7979 / 3619.22 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 5.01 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 85 - 1.75" / 44 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 10.25 / 3.12 |
| Firebox Area (sq ft / m2) | 46 / 4.27 |
| Grate Area (sq ft / m2) | 9.30 / 0.86 |
| Evaporative Heating Surface (sq ft / m2) | 442 / 41.06 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 442 / 41.06 |
| Evaporative Heating Surface/Cylinder Volume | 251.14 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 1488 |
| Same as above plus superheater percentage | 1488 |
| Same as above but substitute firebox area for grate area | 7360 |
| Power L1 | 3360 |
| Power MT | 555.56 |