Data from Ferrovie Dell' Alta Italia, Album Delle Locomotive (Torino, 1o Luglio 1876), T14.
This pair used the Stephenson long boiler and a single driving axle located--like Crampton's innovation--well back along the frame. The two leading carrying axles were fixed in the frame ahead of the drivers with their centres 80" (2.033 m) apart. Driving the rear axle meant placing the cylinders outside and between the two carrying axles, hence the gap. Otherwise, the engine seems orthodox, fitted as it was with a haystack boiler, safety valve stand over the rear carrying axle, and a very tall stack (chimney).
Locobase found an inconsistencies between the given values for the tube diameters, tube lengths, and for the evaporative heating surface area given as 67.7 sq m. The EHS value shown in Locobase's specs is composed of the firebox heating surface area given in the diagram and the tube heating surface area calculated from the stated tube length, external tube diameter, and count.
Both engines were scrapped in 1874.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 168 |
| Locobase ID | 20592 |
| Railroad | Alta Italia (SFAI) |
| Country | Italy |
| Whyte | 4-2-0 |
| Number in Class | 2 |
| Road Numbers | 168-169 |
| Gauge | Std |
| Number Built | 2 |
| Builder | Robert Stephenson & Co |
| Year | 1848 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | |
| Engine Wheelbase (ft / m) | 12.16 / 3.71 |
| Ratio of driving wheelbase to overall engine wheelbase | |
| Overall Wheelbase (engine & tender) (ft / m) | 32.90 / 10.03 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 23,149 / 10,500 |
| Weight on Drivers (lbs / kg) | 23,149 / 10,500 |
| Engine Weight (lbs / kg) | 46,517 / 21,100 |
| Tender Loaded Weight (lbs / kg) | 35,494 / 16,100 |
| Total Engine and Tender Weight (lbs / kg) | 82,011 / 37,200 |
| Tender Water Capacity (gals / ML) | 1320 / 5 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 2.20 / 2 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 39 / 19.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 67.50 / 1715 |
| Boiler Pressure (psi / kPa) | 87 / 600 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 13.98" x 22.01" / 355x559 |
| Tractive Effort (lbs / kg) | 4713 / 2137.78 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.91 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 113 - 2.047" / 52 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 13.52 / 4.12 |
| Firebox Area (sq ft / m2) | 60.82 / 5.65 |
| Grate Area (sq ft / m2) | 10.12 / 0.94 |
| Evaporative Heating Surface (sq ft / m2) | 880 / 81.75 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 880 / 81.75 |
| Evaporative Heating Surface/Cylinder Volume | 225.05 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 880 |
| Same as above plus superheater percentage | 880 |
| Same as above but substitute firebox area for grate area | 5291 |
| Power L1 | 2964 |
| Power MT | 282.28 |