Maurice Demoulin, Locomotive Actuelle ... (Paris: Librairie Polytechnique Ch.Beranger, 1906), p 276.
Both pistons and valves were inside on this 2-cylinder compound eight-wheeler, which left only the eccentric crank and rod outside. In appearance, these locomotives offered a straight boiler topped by ever-diminishing components from the straight stack with flared bell, cylindrical steam dome ahead of the first driving axle, and steam dome over the first driver.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | A 2/4 |
| Locobase ID | 2782 |
| Railroad | Swiss Federal |
| Country | Switzerland |
| Whyte | 4-4-0 |
| Number in Class | 50 |
| Road Numbers | 151-200 |
| Gauge | Std |
| Number Built | 50 |
| Builder | SLM |
| Year | 1905 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | |
| Engine Wheelbase (ft / m) | 23.62 / 7.20 |
| Ratio of driving wheelbase to overall engine wheelbase | |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 66,139 / 30,000 |
| Engine Weight (lbs / kg) | 110,231 / 50,000 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 55 / 27.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 72 / 1829 |
| Boiler Pressure (psi / kPa) | 194.40 / 1340 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 18.11" x 25.98" / 460x660 (1) |
| Low Pressure Cylinders (dia x stroke) (in / mm) | 26.77" x 25.98" / 680x660 (1) |
| Tractive Effort (lbs / kg) | 13,415 / 6084.95 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.93 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | |
| Firebox Area (sq ft / m2) | |
| Grate Area (sq ft / m2) | 23.46 / 2.18 |
| Evaporative Heating Surface (sq ft / m2) | 1383 / 128.50 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 1383 / 128.50 |
| Evaporative Heating Surface/Cylinder Volume | 357.11 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 4561 |
| Same as above plus superheater percentage | 4561 |
| Same as above but substitute firebox area for grate area | |
| Power L1 | |
| Power MT | |