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Italian State Railway class 741[h]II[/h]
To increase the power and efficiency of the widespread 2-8-0 freight locomotive of the class 740, the idea was to rebuild it with a Franco-Crosti boiler. At first, 94 locomotives had been rebuilt between 1937 and 1950...
| Italian State Railway class 741[h]II[/h]Remove | |
|---|---|
| Variant | three-axle tender |
| Built | 1953-1960 |
| Manufacturers | Officina Grandi Riparazioni Verona |
| Wheel arrangement | 1D |
| Gauge | 1435 mm |
| Length | 18075 mm |
| Service mass | 68300 kg |
| Top speed | 65 km/h |
| Power | |
| Engine |
General
| Property | Italian State Railway class 741[h]II[/h]three-axle tender |
|---|---|
| Built | 1953-1960 |
| Manufacturers | Officina Grandi Riparazioni Verona |
| Wheel arrangement | 2-8-0 (Consolidation) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | Italian State Railway class 741[h]II[/h]three-axle tender |
|---|---|
| Length | 18.08 m |
| Wheelbase | 7.30 m |
| Empty mass | 59.8 t |
| Service mass | 68.3 t |
| Adhesion mass | 56 t |
| Total mass | 100.2 t |
| Rigid wheelbase | 2.60 m |
| Axle load | 14.8 t |
Boiler
| Property | Italian State Railway class 741[h]II[/h]three-axle tender |
|---|---|
| Grate area | 2.8 m² |
| Evaporative heating surface | 112.6 m² |
| Superheater surface | 44 m² |
| Total heating surface | 156.6 m² |
Power plant
| Property | Italian State Railway class 741[h]II[/h]three-axle tender |
|---|---|
| Driver diameter | 1,370 mm |
| Boiler pressure | 12 bar |
| Expansion type | simple expansion |
| Cylinders | two, 540 x 700 mm |
Power
| Property | Italian State Railway class 741[h]II[/h]three-axle tender |
|---|---|
| Power source | steam |
| Indicated power | 810 kW (1,101 PS) |
| Top speed | 65 km/h |
| Starting effort | 152.0 kN |
Calculated values
| Property | Italian State Railway class 741[h]II[/h]three-axle tender |
|---|---|
| Factor of adhesion | 1 : 3.61 |
| Optimal speed | 32 km/h |
| Power-to-weight ratio | 11.9 kW/t |
| Adhesive weight/Total | 1 : 1.22 |
| Tractive force/Heating surface | 1 : 20.27 |
| Grate area/Heating surface | 1 : 55.93 |
| Total/Superheater | 1 : 2.56 |
