Strade Ferrate Romane 0-4-2 Locomotives in Italy

Class Details by Steve Llanso of Sweat House Media

Class 141 (Locobase 6244)

Data from (8 July 2004), an 1878 album of locomotives for the SFR reproduced by Allesandro Tuzza. Ansaldo (in Sampierdarena) delivered these two as almost the very first locomotives they built (works #23-24). (later cite: [], Tavola 14.)

Their layout (with the two driving axles leading) had only just been adopted in England. The relatively short boiler gave the design a sturdy, bulldog look, especially with the large roof over the footplate and the increase in height forward from sandbox to steam dome to stack.

Locobase found an inconsistencies between the given values for the tube diameters, tube lengths, and for the evaporative heating surface area given as 81.1 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.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID6244
RailroadStrade Ferrate Romane (SFR)
Number in Class2
Road Numbers141-142
Number Built2
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 7.02 / 2.14
Engine Wheelbase (ft / m)14.04 / 4.28
Ratio of driving wheelbase to overall engine wheelbase 0.50
Overall Wheelbase (engine & tender) (ft / m)31.73 / 9.67
Axle Loading (Maximum Weight per Axle) (lbs / kg)25,574 / 11,600
Weight on Drivers (lbs / kg)44,864 / 20,350
Engine Weight (lbs / kg)57,871 / 26,250
Tender Loaded Weight (lbs / kg)44,092 / 20,000
Total Engine and Tender Weight (lbs / kg)101,963 / 46,250
Tender Water Capacity (gals / ML)1320 / 5
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)37 / 18.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)60 / 1524
Boiler Pressure (psi / kPa)101.50 / 7
High Pressure Cylinders (dia x stroke) (in / mm)15.98" x 24.02" / 406x610
Tractive Effort (lbs / kg)8820 / 4000.69
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.09
Heating Ability
Tubes (number - dia) (in / mm)137 - 2.047" / 52
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)10.24 / 3.12
Firebox Area (sq ft / m2)83.42 / 7.75
Grate Area (sq ft / m2)12.81 / 1.19
Evaporative Heating Surface (sq ft / m2)873 / 81.07
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)873 / 81.07
Evaporative Heating Surface/Cylinder Volume156.57
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1300
Same as above plus superheater percentage1300
Same as above but substitute firebox area for grate area8467
Power L12348
Power MT230.76

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