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Italian State Railway classes 746 and 747
When in the early 1920s the existing six-coupled express locomotives of the FS could no longer provide sufficient adhesive weight on hilly lines, the FS was one of the first railways in Europe to develop an eight-coup...
| Italian State Railway classes 746 and 747Remove | |
|---|---|
| Variant | Standard |
| Built | 1923, 1926-1927 |
| Manufacturers | Breda;Ansaldo |
| Wheel arrangement | 1D1 |
| Gauge | 1435 mm |
| Length | 22785 mm |
| Service mass | 93000 kg |
| Top speed | 110 km/h |
| Power | |
| Engine |
General
| Property | Italian State Railway classes 746 and 747 Standard Remove |
|---|---|
| Built | 1923, 1926-1927 |
| Manufacturers | Breda, Ansaldo |
| Wheel arrangement | 2-8-2 (Mikado) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | Italian State Railway classes 746 and 747 Standard Remove |
|---|---|
| Length | 22.79 m |
| Length loco | 13.04 m |
| Wheelbase | 11.24 m |
| Total wheelbase | 20.16 m |
| Empty mass | 85 t |
| Service mass | 93 t |
| Adhesion mass | 66 t |
| Total mass | 142.6 t |
| Rigid wheelbase | 7.92 m |
| Axle load | 16.5 t |
| Water capacity | 22,000 l |
| Fuel capacity | 6 t (coal) |
Boiler
| Property | Italian State Railway classes 746 and 747 Standard Remove |
|---|---|
| Grate area | 4.3 m² |
| Firebox surface | 17 m² |
| Tube heating surface | 220 m² |
| Evaporative heating surface | 237 m² |
| Superheater surface | 67 m² |
| Total heating surface | 304.0 m² |
Power plant
| Property | Italian State Railway classes 746 and 747 Standard Remove |
|---|---|
| Driver diameter | 1,880 mm |
| Boiler pressure | 14 bar |
| Expansion type | compound |
| Cylinders | four, HP: 490 x 680 mm and LP: 720 x 680 mm |
Power
| Property | Italian State Railway classes 746 and 747 Standard Remove |
|---|---|
| Power source | steam |
| Estimated power | 1,350 kW (1,835 PS) |
| Top speed | 110 km/h |
| Starting effort | 141.3 kN |
| Starting effort simple | 169.5 kN |
Calculated values
| Property | Italian State Railway classes 746 and 747 Standard Remove |
|---|---|
| Factor of adhesion | 1 : 4.58 |
| Optimal speed | 58 km/h |
| Power-to-weight ratio | 14.5 kW/t |
| Heating Surface Equivalent | 456.0 m² |
| Cylinder volume/HSE | 1 : 1,169.57 |
| Adhesive weight/Total | 1 : 1.41 |
| Tractive force/Heating surface | 1 : 9.71 |
| Grate area/Heating surface | 1 : 70.70 |
| Firebox/Tube surface | 1 : 12.94 |
| Total/Superheater | 1 : 3.54 |
