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The reference for locomotives and railcars

Bavarian Pt 2/4 N

German Reichsbahn class 721

Germany 1909 2 produced
https://www.woernitz-franken.de/dampfzeit.htm

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 The two Pt 2/4 N were later taken over by the Reichsbahn as 72 101 and 72 102 and withdrawn in 1928.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
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