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Italian State Railway class 690 II
Around 1910, the FS also realized that, thanks to superheater technology, compound engines could be dispensed with. Therefore the Pacifics of the class 690 II with four cylinders were commissioned. For the first time ...
General
| Property | Italian State Railway class 690 IIRemove |
|---|---|
| Built | 1911-1914 |
| Manufacturers | Breda, Officine Meccaniche, Ansaldo |
| Wheel arrangement | 4-6-2 (Pacific) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Italian State Railway class 690 IIRemove |
|---|---|
| Length | 22.28 m |
| Length loco | 13.06 m |
| Wheelbase | 10.05 m |
| Rigid wheelbase | 4.30 m |
| Empty weight | 78.8 t |
| Service weight | 87.3 t |
| Adhesive weight | 51 t |
| Axle load | 17.1 t |
| Total weight | 136.9 t |
| Water capacity | 20,000 l |
| Fuel capacity | 8 t (coal) |
Boiler
| Property | Italian State Railway class 690 IIRemove |
|---|---|
| Grate area | 3.5 m² |
| Firebox surface | 16 m² |
| Tube heating surface | 194 m² |
| Evaporative heating surface | 210 m² |
| Superheater surface | 67 m² |
| Total heating surface | 277.0 m² |
Power plant
| Property | Italian State Railway class 690 IIRemove |
|---|---|
| Driver diameter | 2,030 mm |
| Boiler pressure | 12 bar |
| Expansion type | simple expansion |
| Cylinders | four, 450 x 680 mm |
Power
| Property | Italian State Railway class 690 IIRemove |
|---|---|
| Power source | steam |
| Indicated power | 1,030 kW (1,400 PS) |
| Top speed | 130 km/h |
| Starting effort | 138.4 kN |
Calculated values
| Property | Italian State Railway class 690 IIRemove |
|---|---|
| Factor of adhesion | 1 : 3.62 |
| Optimal speed | 45 km/h |
| Power-to-weight ratio | 11.8 kW/t |
| Heating Surface Equivalent | 424.0 m² |
| Cylinder volume/HSE | 1 : 1,020.28 |
| Adhesive weight/Total | 1 : 1.71 |
| Tractive force/Heating surface | 1 : 10.43 |
| Grate area/Heating surface | 1 : 79.14 |
| Firebox/Tube surface | 1 : 12.13 |
| Total/Superheater | 1 : 3.13 |
