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Imperial-Royal State Railways class 79
The class 79 emerged from a competition in which a freight locomotive for the Arlberg was sought. In addition to this, the classes 76 and 78 also competed, as well as the victorious class 73. The design from Floridsdo...
General
| Property | Imperial-Royal State Railways class 79Remove |
|---|---|
| Built | 1884-1885 |
| Manufacturers | Floridsdorf |
| Wheel arrangement | 0-8-4T (Engerth) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Imperial-Royal State Railways class 79Remove |
|---|---|
| Length | 12.66 m |
| Wheelbase | 8.13 m |
| Rigid wheelbase | 2.63 m |
| Empty weight | 55.2 t |
| Service weight | 72.5 t |
| Adhesive weight | 53 t |
| Axle load | 13.3 t |
| Water capacity | 8,000 l |
| Fuel capacity | 3.8 t (coal) |
Boiler
| Property | Imperial-Royal State Railways class 79Remove |
|---|---|
| Grate area | 2.5 m² |
| Firebox surface | 10 m² |
| Tube heating surface | 154 m² |
| Evaporative heating surface | 164 m² |
| Total heating surface | 164.0 m² |
Power plant
| Property | Imperial-Royal State Railways class 79Remove |
|---|---|
| Driver diameter | 1,100 mm |
| Boiler pressure | 11 bar |
| Expansion type | simple expansion |
| Cylinders | two, 550 x 610 mm |
Power
| Property | Imperial-Royal State Railways class 79Remove |
|---|---|
| Power source | steam |
| Estimated power | 450 kW (612 PS) |
| Top speed | 35 km/h |
| Starting effort | 156.8 kN |
Calculated values
| Property | Imperial-Royal State Railways class 79Remove |
|---|---|
| Factor of adhesion | 1 : 3.31 |
| Optimal speed | 18 km/h |
| Power-to-weight ratio | 6.2 kW/t |
| Heating Surface Equivalent | 214.0 m² |
| Cylinder volume/HSE | 1 : 1,354.44 |
| Adhesive weight/Total | 1 : 1.37 |
| Tractive force/Heating surface | 1 : 19.97 |
| Grate area/Heating surface | 1 : 65.60 |
| Firebox/Tube surface | 1 : 15.40 |
