Palatine P 4
| Palatine P 4 | |
|---|---|
 P 4290
|
|
| Numbering: | 286-291, 302-305, 433 |
| Number: | 11 |
| Manufacturer: | Maffei |
| Year of construction (s): | 1905-1906 |
| Retirement: | 1925 |
| Type : | 2'B1 'h4v / n4v |
| Gauge : | 1435 mm ( standard gauge ) |
| Length over buffers: | 18,712 mm |
| Service mass: | 74.3 t |
| Friction mass: | 33.0 t |
| Wheel set mass : | 16.5 t |
| Top speed: | 100 km / h |
| Driving wheel diameter: | 2,010 mm |
| Impeller diameter front: | 960 mm |
| Rear wheel diameter: | 1,216 mm |
| Number of cylinders: | 4th |
| Cylinder diameter: | 2 × 360/590 mm |
| Piston stroke: | 640 mm |
| Boiler overpressure: | 15 bar |
| Grate area: | 3.80 m² |
| Superheater area : | 41.70 m² |
| Evaporation heating surface: | 181.30 m² |
The class P 4 steam locomotives of the Palatinate Railway were express locomotives with a 2'B1 '( Atlantic ) wheel arrangement and a four-cylinder compound engine . A total of eleven locomotives were manufactured by Maffei , the track numbers 286-291 in 1905 and the numbers 302-305 and 433 in 1906. They replaced the class P 3.1 in express train service.
The locomotives were initially equipped with Pielock superheaters , which, however, had to be dismantled after a few years due to corrosion damage. From then on, the locomotives ran as wet steam engines.
The P 4 was one of the first locomotives with bar frames in Germany. It was based on the Bavarian genus S 2/5 , created in 1903 ; up to the second coupling axle, both types were almost the same apart from details and minor dimensional deviations. However, unlike the S 2/5, the P 4 had a wide firebox that was fully located behind the coupling wheels . Therefore, the distance between the coupling axle and the rear barrel axle had to be significantly increased and the barrel axle had to be designed to be radially adjustable. This, as well as the draft cab of the P 4, gave the locomotives their own look in the rear.
The P4 was also closely related to other Bavarian types of locomotives from Maffei: The engine was adopted almost unchanged for the class S 2/6 high-speed locomotive built in 1906 - only the cylinder diameters were slightly enlarged - and both locomotives have many other things in common. The family resemblance to the class S 3/6 built from 1908 onwards is also unmistakable; the latter looks like an enlarged P 4 with a coupling axis added.
In the preliminary re-designation plan of the Deutsche Reichsbahn all eleven locomotives with the numbers 14 151 to 14 161 were planned, but they were already decommissioned before the re-designation.
literature
- Wilhelm Reuter: The most beautiful of the rails - The history of the Atlantic . Transpress, Berlin 1993, ISBN 3-613-01512-9