Data from "Narrow Gauge Loco for Mexico," The Locomotive Magazine, Volume VII [7] (August 1902), p. 135. See also DeGolyer, Volume 20, p. 261. Works number was 15241 in March 1897.
Tiny,
teeny,
minute,
flea-sized -- this little Eight-wheeler ran on 14 lb/yard (7 kg/metre) rail, scaled 1 % grades, and negotiated curves of as little as 39-ft (10-meter) radius on a 1-mile (1.6 km) logging trail; water stations were 2,186 yards (1.25 miles/2 km) apart. The "tip over" grate--designed to burn "briquettes, preferably"-- was operated by a lever and "arranged to dump fire immediately."
The locomotive's name was written in "elegant letters" on both sides of the cab.
Susana was the smallest locomotive ever built by Baldwin for commercial purposes. Locobase also notes that all other locomotives with similar heating surface areas (80-90 sq ft) were four-coupled tanks and finds the next largest 4-4-0 to have owned 225 sq ft (20.9 sq m) of heating surface area.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | Susana |
| Locobase ID | 10235 |
| Railroad | F C de Tacubaya |
| Country | Mexico |
| Whyte | 4-4-0 |
| Number in Class | 1 |
| Road Numbers | 2 |
| Gauge | 60 cm |
| Number Built | 1 |
| Builder | Burnham, Williams & Co |
| Year | 1897 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 3 / 0.91 |
| Engine Wheelbase (ft / m) | 10.33 / 3.15 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.29 |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 6500 / 2948 |
| Engine Weight (lbs / kg) | 11,200 / 5080 |
| Tender Loaded Weight (lbs / kg) | 11,000 / 4990 |
| Total Engine and Tender Weight (lbs / kg) | 22,200 / 10,070 |
| Tender Water Capacity (gals / ML) | 600 / 2.27 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 5 / 2.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 23 / 584 |
| Boiler Pressure (psi / kPa) | 150 / 1030 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 6" x 10" / 152x254 |
| Tractive Effort (lbs / kg) | 1996 / 905.37 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.26 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 32 - 1.5" / 38 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 6 / 1.83 |
| Firebox Area (sq ft / m2) | 13.40 / 1.24 |
| Grate Area (sq ft / m2) | 2.40 / 0.22 |
| Evaporative Heating Surface (sq ft / m2) | 88 / 8.18 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 88 / 8.18 |
| Evaporative Heating Surface/Cylinder Volume | 266.67 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 360 |
| Same as above plus superheater percentage | 360 |
| Same as above but substitute firebox area for grate area | 2010 |
| Power L1 | 2701 |
| Power MT | 1832.21 |