Strade Ferrate della Sicilia / FS 2-6-2 Locomotives in Italy


Class Details by Steve Llanso of Sweat House Media

Class Gruppo H / Gruppo 910 (Locobase 6217)

Data from the Rete Sicula website [link] ... (visited 5 July 2004), [link] (visited 30 June 2005); and "Locomotiva FS 910" in Wikipedia at [link], 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
ClassGruppo H / Gruppo 910
Locobase ID6217
RailroadStrade Ferrate della Sicilia / FS
CountryItaly
Whyte2-6-2T
Number in Class12
Road NumbersRS 401-406/Gr 9001-9012
GaugeStd
Number Built12
BuilderAnsaldo
Year1905
Valve GearWalschaert
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 Volume464.64
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation4829
Same as above plus superheater percentage4829
Same as above but substitute firebox area for grate area22,624
Power L15092
Power MT363.71

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