Data from "Mogul Locomotive, Siamese Rys", The Locomotive Magazine, Vol VI (May 1901), p. 88.
At the time of this class's delivery, the railways in Siam/Thailand were still set to standard gauge. When seen from the side, the design looked as if it was missing another driving axle behind the valve gear. Instead, as with many Krauss engines, the pony truck and the first driven axle were combined in a truck that greatly reduced the rigid wheelbase. The fuel was wood, as could be inferred from the large, inversely tapered stack.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | unknown |
| Locobase ID | 10187 |
| Railroad | Siam Railways |
| Country | Thailand |
| Whyte | 2-6-0 |
| Number in Class | |
| Road Numbers | |
| Gauge | Std |
| Number Built | |
| Builder | Krauss |
| Year | 1900 |
| Valve Gear | Heusinger |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 8.79 / 2.68 |
| Engine Wheelbase (ft / m) | 18.37 / 5.60 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.48 |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 62,170 / 28,200 |
| Engine Weight (lbs / kg) | 79,366 / 36,000 |
| Tender Loaded Weight (lbs / kg) | 67,682 / 30,700 |
| Total Engine and Tender Weight (lbs / kg) | 147,048 / 66,700 |
| Tender Water Capacity (gals / ML) | 2788 / 10.56 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 35 / 17.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 49.60 / 1260 |
| Boiler Pressure (psi / kPa) | 174 / 1200 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 17.32" x 21.26" / 440x540 |
| Tractive Effort (lbs / kg) | 19,017 / 8625.98 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.27 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 198 - 1.732" / 44 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 12.14 / 3.70 |
| Firebox Area (sq ft / m2) | 90.38 / 8.40 |
| Grate Area (sq ft / m2) | 17.22 / 1.60 |
| Evaporative Heating Surface (sq ft / m2) | 1180 / 109.67 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 1180 / 109.67 |
| Evaporative Heating Surface/Cylinder Volume | 203.54 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 2996 |
| Same as above plus superheater percentage | 2996 |
| Same as above but substitute firebox area for grate area | 15,726 |
| Power L1 | 4049 |
| Power MT | 430.75 |