Data from "Mallet Locomotive at the Turin Exhibition," Locomotive Magazine, Volume 18 (15 February 1912), pp. 45-46.
Standard -gauge Mallet tanks appeared on several Continental railways, but this design had an unusually high LP:HP ratio of 3.35. Its layout was classic Mallet as practiced.
They operated for almost 50 years, mostly on freight service.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | Gruppo 50 |
| Locobase ID | 20069 |
| Railroad | Societa Nazionale |
| Country | Italy |
| Whyte | 0-4-4-0T |
| Number in Class | 7 |
| Road Numbers | 51-57 |
| Gauge | Std |
| Number Built | 7 |
| Builder | Borsig |
| Year | 1909 |
| Valve Gear | Heusinger |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 4.76 / 1.45 |
| Engine Wheelbase (ft / m) | 16.40 / 5 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.29 |
| Overall Wheelbase (engine & tender) (ft / m) | 16.40 / 5 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 15,432 / 7000 |
| Weight on Drivers (lbs / kg) | 116,481 / 52,835 |
| Engine Weight (lbs / kg) | 116,481 / 52,835 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | 116,481 / 52,835 |
| Tender Water Capacity (gals / ML) | 1320 / 5 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 1.70 / 2 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 49 / 24.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 43.30 / 1100 |
| Boiler Pressure (psi / kPa) | 169.70 / 1170 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 14.96" x 19.69" / 380x500 |
| Low Pressure Cylinders (dia x stroke) (in / mm) | 27.56" x 19.69" / 700x500 |
| Tractive Effort (lbs / kg) | 22,678 / 10286.58 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 5.14 |
| 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) | 21.53 / 2 |
| Evaporative Heating Surface (sq ft / m2) | 1183 / 109.90 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 1183 / 109.90 |
| Evaporative Heating Surface/Cylinder Volume | 295.32 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 3654 |
| Same as above plus superheater percentage | 3654 |
| Same as above but substitute firebox area for grate area | |
| Power L1 | |
| Power MT | |