PKKB No. 20
| Prignitzer Kreiskleinbahnen No. 20, 99.471 series |
|
|---|---|
| Numbering: | Prignitzer Kreiskleinbahnen No. 20 99 4711 |
| Number: | 1 |
| Manufacturer: | Hartmann |
| Year of construction (s): | 1920 |
| Retirement: | 1966 |
| Type : | C1 'n2t |
| Genre : | K 34.7 |
| Gauge : | 750 mm |
| Length over buffers: | 7,190 mm |
| Height: | 3,200 mm |
| Width: | 2,250 mm |
| Fixed wheelbase: | 2,000 mm |
| Total wheelbase: | 3,220 mm |
| Empty mass: | 19.5 t |
| Service mass: | 25 t |
| Friction mass: | 21 t |
| Top speed: | 35 km / h |
| Indexed performance : | 125 PSi / 92 kW |
| Starting tractive effort: | 22.56 kN |
| Coupling wheel diameter: | 780 mm |
| Driving wheel diameter: | 780 mm |
| Rear wheel diameter: | 480 mm |
| Control type : | Heusinger |
| Number of cylinders: | 2 |
| Cylinder diameter: | 250 mm |
| Piston stroke: | 400 mm |
| Boiler overpressure: | 12 bar |
| Number of heating pipes: | 88 |
| Heating pipe length: | 2,475 mm |
| Grate area: | 0.6 m² |
| Radiant heating surface: | 2.95 m² |
| Tubular heating surface: | 27.37 |
| Evaporation heating surface: | 30.32 m² |
| Water supply: | 2.4 m³ |
| Fuel supply: | 0.8 tons of coal |
| Locomotive brake: | Throw lever handbrake |
| Train brake: | Lever brake |
The PKKB No. 20 was a narrow-gauge tank locomotive of the Ostprignitzer Kreisbahn .
history
The steam locomotive intended for use on the Lindenberg – Pritzwalk route was built in 1920 by the Sächsische Maschinenfabrik. Richard Hartmann built with the serial number 4420. The locomotive was given track number 20 by the customer . After the Deutsche Reichsbahn (DR) took over the railway in 1949, it was assigned the DR operating number 99 4711. The machine was taken out of service on August 26, 1966; it was then scrapped.
technical features
The locomotive had a sheet metal frame designed as an inner frame. The rear wheelset was designed as an Adam axle .
In view of the low axle mass of only 7 t required for the route, the boiler with the long boiler lying freely above the frame was quite small, although the overall structure of the locomotive would have allowed a larger boiler. The disadvantage of the machine, which, however, certainly met the expectations placed on it, was therefore a certain tendency towards rapid exhaustion of the boiler reserve.
The locomotive's steam engine, equipped with a flat slide, single-rail crosshead and Heusinger control with hanging iron and designed as an external two-cylinder wet steam engine with simple steam expansion, drove the third set of coupled wheels as a driving wheel set.
Two water boxes next to the boiler and a coal box on the rear wall of the driver's cab were used to accommodate the company supplies.
literature
- Manfred Weisbrod, Hans Wiegard, Hans Müller, Wolfgang Petznick: German Locomotive Archive. Steam locomotives. Vol. 4: Series 99 . transpress, Berlin 1995, ISBN 3-344-70903-8 , p. 190 ff, p. 264 f.