Strade Ferrate Romane 0-4-2 Locomotives in Italy
Class Details by Steve Llanso of Sweat House Media
Class 141 (Locobase 6244)
Data from users.libero.it/allesandro.tuzza/fonti/sfr/1879sfrindice.htm (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 Middle Run Media | |
|---|---|
| Class | 141 |
| Locobase ID | 6244 |
| Railroad | Strade Ferrate Romane (SFR) |
| Country | Italy |
| Whyte | 0-4-2 |
| Number in Class | 2 |
| Road Numbers | 141-142 |
| Gauge | Std |
| Number Built | 2 |
| Builder | Ansaldo |
| Year | 1859 |
| Valve Gear | Stephenson |
| 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 / 700 |
| 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 Volume | 156.57 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 1300 |
| Same as above plus superheater percentage | 1300 |
| Same as above but substitute firebox area for grate area | 8467 |
| Power L1 | 2348 |
| Power MT | 230.76 |