Data from the Rete Sicula website [] ... (visited 5 July 2004), [
] (visited 30 June 2005); and "Locomotiva FS 910" in Wikipedia at [
], last accessed 28 July 2022.
This was a relatively heavy Prairie tank design for an Italian locomotive of the period. It also seems to have been the only RS class to use cross-compounding instead of simple expansion. Its leading and trailing trucks used Adams bogies, which Wikipedia notes made it a stable locomotive at high speeds. It was rated at 75 km/h (47 mph).
At the time of the Ferrovie dello Stato takeover in 1905, all six were in service and shedded at Palermo. The FS immediately added 6 more (see Locobase 6623) and grouped all 12 under Gruppo 910. They then added 42 more; see Locobase .
NB: Direct (firebox) heating surface area is an estimate derived from calculating the tube heating surface area and subtracting it from the given evaporative heating surface area.
Principal Dimensions by Steve Llanso of Middle Run Media | |
---|---|
Class | Gruppo H / Gruppo 910 |
Locobase ID | 6217 |
Railroad | Strade Ferrate della Sicilia / FS |
Country | Italy |
Whyte | 2-6-2T |
Number in Class | 12 |
Road Numbers | RS 401-406/Gr 9001-9012 |
Gauge | Std |
Number Built | 12 |
Builder | Ansaldo |
Year | 1905 |
Valve Gear | Walschaert |
Locomotive Length and Weight | |
Driver Wheelbase (ft / m) | 12.47 / 3.80 |
Engine Wheelbase (ft / m) | 27.56 / 8.40 |
Ratio of driving wheelbase to overall engine wheelbase | 0.45 |
Overall Wheelbase (engine & tender) (ft / m) | 27.56 / 8.40 |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
Weight on Drivers (lbs / kg) | 92,594 / 42,000 |
Engine Weight (lbs / kg) | 141,096 / 64,000 |
Tender Loaded Weight (lbs / kg) | |
Total Engine and Tender Weight (lbs / kg) | |
Tender Water Capacity (gals / ML) | 1003 / 3.80 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 3.30 / 3 |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 51 / 25.50 |
Geometry Relating to Tractive Effort | |
Driver Diameter (in / mm) | 59.10 / 1500 |
Boiler Pressure (psi / kPa) | 188.50 / 1300 |
High Pressure Cylinders (dia x stroke) (in / mm) | 18.11" x 23.62" / 460x600 (1) |
Low Pressure Cylinders (dia x stroke) (in / mm) | 27.56" x 23.62" / 700x600 (1) |
Tractive Effort (lbs / kg) | 14,668 / 6653.30 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 6.31 |
Heating Ability | |
Tubes (number - dia) (in / mm) | 222 - 2.047" / 52 |
Flues (number - dia) (in / mm) | |
Flue/Tube length (ft / m) | |
Firebox Area (sq ft / m2) | 120.02 / 11.15 |
Grate Area (sq ft / m2) | 25.62 / 2.38 |
Evaporative Heating Surface (sq ft / m2) | 1636 / 152 |
Superheating Surface (sq ft / m2) | |
Combined Heating Surface (sq ft / m2) | 1636 / 152 |
Evaporative Heating Surface/Cylinder Volume | 464.64 |
Computations Relating to Power Output (More Information) | |
Robert LeMassena's Power Computation | 4829 |
Same as above plus superheater percentage | 4829 |
Same as above but substitute firebox area for grate area | 22,624 |
Power L1 | 5092 |
Power MT | 363.71 |