Imperial-Royal State Railways class 79
Austria-Hungary 1884 2 produced
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 Floridsdorf had a Klose supporting tender and, like all the competitors, four coupled axles. The two machines differed in that one had an inside frame and one had an outside frame. Only the 79.02 came to the BBÖ, which remained in service until 1926.
Technical data
General
- Built
- 1884-1885
- Manufacturers
- Floridsdorf
- Wheel arrangement
- 0-8-4T (Engerth)
- Gauge
- 1,435 mm (Standard gauge)
Dimensions and weights
- Length
- 12.66 m
- Wheelbase
- 8.13 m
- Empty mass
- 55.2 t
- Service mass
- 72.5 t
- Adhesion mass
- 53 t
- Rigid wheelbase
- 2.63 m
- Axle load
- 13.3 t
- Water capacity
- 8,000 l
- Fuel capacity
- 3.8 t (coal)
Boiler
- 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
- Driver diameter
- 1,100 mm
- Boiler pressure
- 11 bar
- Expansion type
- simple expansion
- Cylinders
- two, 550 x 610 mm
Power
- Power source
- steam
- Estimated power
- 450 kW (612 PS)
- Top speed
- 35 km/h
- Starting effort
- 156.8 kN
Calculated values
- 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
