Prussian P 4

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Prussian P 4
P4 Lok mit Truppen.jpg
Quantity 1
Manufacturer Henschel
Year(s) of manufacture 1898
Retired 1921
Wheel arrangement 4-4-0
Axle arrangement 2'B h2
Type P 24.45
Track gauge 1,435 mm (4 ft 8 12 in)
Length over buffers 16,411 mm
Overall wheelbase 7,400 mm
Empty weight 44.6 t
Service weight 49.1 t
Adhesive weight 31.0 t
Axle load 15.5 t
Top speed 90 km/h
Indicated Power 675 kW (900 PS)
Coupled wheel diameter 1,750 mm
Carrying wheel diameter 1,000 mm
No. of cylinders 2
Cylinder bore 460 mm
Piston stroke 600 mm
Boiler Overpressure 12 bar
No. of heating tubes 141
No. of smoke tubes 1 fire tube
Grate area 2.32 m2
Radiative heating area 8.9 m2
Tube heating area 76.2 m2
Superheater area 21.0 m2
Evaporative heating area 85.1 m2
Tender pr 3 T 15
Water capacity 15.0 m3

The Prussian P 4 was a derivative of the P 4.1 (Hanover variant) and the second superheated steam locomotive in the world.


The engine was based on that of the Class P 4.1 that had Hanomag had produced in large numbers since 1892. It had slightly larger wheels and, due to its new design, significantly fewer heating tubes. The superheater and the steam engine were entirely independent designs.

Service and preservation[edit]

In 1898 a one-off was delivered by Hanomag to the Prussian state railways. The economy of the superheated system was soon proven in 1899 by the engine during trial runs from Kassel. Apart from a short stay at Halle the engine was assigned to Kassel as Cassel 131 and, from 1906, as P 4 Cassel 1846. In 1921, after the First World War, the engine was mothballed, along with many other machines of similar class. With its sectioned boiler the P 4 stood for a long time in the Transport and Construction Museums, part of Museum of the Present at Hamburger Bahnhof in Berlin[clarification needed].

See also[edit]


  • Wagner, Andreas; Bäzold, Dieter; Zschech, Rainer (1997). Lokomotiv-Archiv Preußen Band 4. Augsburg: Bechtermünz. ISBN 3-86047-573-8.