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Imperial-Royal State Railways class 73
After the four class 76 freight locomotives had been put into service on the Arlberg in 1884, the class 73 shown here was introduced only one year later. The new locomotive was also a 0-8-0, but had smaller cylinders ...
General
| Property | Imperial-Royal State Railways class 73 as built |
|---|---|
| Built | 1885-1909 |
| Manufacturers | Wiener Neustadt, Floridsdorf, Krauss Linz, StEG, Č, KD |
| Wheel arrangement | 0-8-0 (Eight-coupled) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Imperial-Royal State Railways class 73 as built |
|---|---|
| Length | 16.48 m |
| Wheelbase | 3.90 m |
| Rigid wheelbase | 2.55 m |
| Total wheelbase | 11.64 m |
| Empty weight | 47.5 t |
| Service weight | 55.1 t |
| Adhesive weight | 55.1 t |
| Water capacity | 12,000 l |
| Fuel capacity | 7.2 t (coal) |
Boiler
| Property | Imperial-Royal State Railways class 73 as built |
|---|---|
| Grate area | 2.25 m² |
| Firebox surface | 11.2 m² |
| Tube heating surface | 170.8 m² |
| Evaporative heating surface | 182 m² |
| Total heating surface | 182.0 m² |
Power plant
| Property | Imperial-Royal State Railways class 73 as built |
|---|---|
| Driver diameter | 1,100 mm |
| Boiler pressure | 10 bar |
| Expansion type | simple expansion |
| Cylinders | two, 500 x 570 mm |
Power
| Property | Imperial-Royal State Railways class 73 as built |
|---|---|
| Power source | steam |
| Estimated power | 525 kW (714 PS) |
| Top speed | 35 km/h |
| Starting effort | 110.1 kN |
Calculated values
| Property | Imperial-Royal State Railways class 73 as built |
|---|---|
| Factor of adhesion | 1 : 4.91 |
| Optimal speed | 29 km/h |
| Power-to-weight ratio | 9.5 kW/t |
| Heating Surface Equivalent | 238.0 m² |
| Cylinder volume/HSE | 1 : 940.50 |
| Adhesive weight/Total | 1 : 1.00 |
| Tractive force/Heating surface | 1 : 12.64 |
| Grate area/Heating surface | 1 : 80.89 |
| Firebox/Tube surface | 1 : 15.25 |
