Bavarian Pt 2/4 N
German Reichsbahn class 721
Germany 1909 2 produced
When the Pt 2/3 was designed, it was not clear whether its rigid 2-4-0 wheel arrangement was suitable for branch lines with sharp curves. So for comparison, two locomotives were built which had a two-axle bogie instead of the rigid leading axle. As there was already a superheated passenger tank locomotive with four axles of which two were powered, the new saturated locomotive was called Pt 2/4 N. Since the more complex design with the bogie did not have many advantages, the cheaper Pt 2/3 was bought in greater Numbers. The two Pt 2/4 N were later taken over by the Reichsbahn as 72 101 and 72 102 and withdrawn in 1928.
Technical data
General
- Built
- 1909
- Manufacturers
- Krauss
- Wheel arrangement
- 4-4-0T (American)
- Gauge
- 1,435 mm (Standard gauge)
Dimensions and weights
- Length
- 9.07 m
- Service mass
- 39 t
- Adhesion mass
- 26.2 t
- Axle load
- 13.2 t
- Water capacity
- 6,000 l
- Fuel capacity
- 1.1 t (coal)
Boiler
- Grate area
- 1.22 m²
- Evaporative heating surface
- 73.56 m²
- Total heating surface
- 73.6 m²
Power plant
- Driver diameter
- 1,250 mm
- Boiler pressure
- 12 bar
- Expansion type
- simple expansion
- Cylinders
- two, 350 x 500 mm
Power
- Power source
- steam
- Estimated power
- 250 kW (340 PS)
- Top speed
- 65 km/h
- Starting effort
- 50.0 kN
Calculated values
- Factor of adhesion
- 1 : 5.14
- Optimal speed
- 31 km/h
- Power-to-weight ratio
- 6.4 kW/t
- Adhesive weight/Total
- 1 : 1.49
- Tractive force/Heating surface
- 1 : 14.19
- Grate area/Heating surface
- 1 : 60.30