Prussian G 8.3
| G 8.3 (Prussia) DR series 56 1 PKP Tr3 |
|
|---|---|
| Numbering: | DR 56 101-185 |
| Number: | 85 |
| Manufacturer: | Henschel |
| Year of construction (s): | 1919-1920 |
| Retirement: | 1967 |
| Type : | 1'D h3 |
| Gauge : | 1435 mm ( standard gauge ) |
| Length over buffers: | 16,975 mm |
| Service mass: | 82.5 t |
| Friction mass: | 70.7 t |
| Wheel set mass : | 17.9 t |
| Top speed: | 65 km / h - 75 km / h |
| Indexed performance : | 912 kW |
| Driving wheel diameter: | 1400 mm |
| Impeller diameter front: | 1000 mm |
| Number of cylinders: | 3 |
| Cylinder diameter: | 520 mm |
| Piston stroke: | 660 mm |
| Boiler overpressure: | 14 bar |
| Grate area: | 3.43 m² |
| Superheater area : | 53.12 m² |
| Evaporation heating surface: | 167.05 m² |
| Tender: | pr 3 T20 |
| Water supply: | 20.0 m³ |
The Prussian G 8.3 were freight locomotives of the type 1'D h3 with superheated steam triple engines. The series was developed after the First World War because of the lack of freight locomotives . A suggestion from Württemberg was taken up to design a locomotive with a 1'D wheel arrangement from the 1'E locomotive of the Prussian type G 12 . The first vehicle was delivered in 1918. Compared to the G 12, a coupling axle and a long boiler section were omitted and the cylinder diameter was reduced. After it had proven itself, a total of 85 series locomotives were put into service, all of which were taken over by the Deutsche Reichsbahn . According to the re- naming plan of 1925, they were given the series designation 56 1 and the company numbers 56 101-185. A further construction was not carried out because of the maintenance-intensive internal engine and because it had been found that simply shortening a locomotive does not lead to optimal results in favor of the simplified, but otherwise identical G 8.2 with twin engine.
Of the 68 vehicles that survived World War II , six went to the Deutsche Bundesbahn , which sold them to private railways until 1948 , and 62 to the Deutsche Reichsbahn . They decommissioned these by 1967, so they no longer received EDP numbers. In Poland, 16 machines remained with PKP , which were called Tr3s there.
technical features
The machines were built on a bar frame taken over from the G 12 type, shortened by a coupling axle, the barrel axle was a bit of a puddle with a side deflection of ± 80 millimeters. The first, third and fourth coupling axles were firmly mounted in the frame, the second had ± 25 millimeters of lateral displacement and the drive axle had flanges that were 15 millimeters less. The suspension springs of the running axle as well as the first and second coupling axles were connected by balancing levers, the third and fourth coupling axles were suspended by a common suspension spring on both sides. The locomotive supported itself on three points on the running gear. The horizontally installed outer cylinder and the inclined inner cylinder acted on the third coupling axis. The cylinders were equipped with angle valves operated by compressed air as an idling device and cylinder safety valves. The control was of the Heusinger type with a Kuhn loop , that of the inner cylinder was derived from the slide crossheads of the outer cylinder via two transmission shafts. There was central lubrication for the parts under steam.
The machines were supplied with the single- release Knorr (Kbr mZ) air brake , the two-stage Knorr air pump was on the right-hand side above the drive axle. The coupling axles were braked on one side from the front. On the crest of the long boiler there were two sandboxes, the wheels of the first and third coupling axles could be sanded from the front, those of the second from both sides and those of the fourth from behind. There were steam heating connections on the locomotive and the tender. The locomotives were supplied with Pintsch type grease gas lighting; later they received electrical lighting with a turbo generator to the left of the chimney.
The boiler consisted of two long boiler sections, the standing boiler was typical for Prussian locomotives, type Belpaire, built around 1920 . It was equipped with a feed dome on the first, the steam dome with wet steam regulator on the second boiler section and a smoke tube superheater type Schmidt. The boilers were supplied with steel fire boxes , which were later replaced by copper fire boxes . The feed device consisted of a piston feed pump type Knorr with surface preheater and a steam jet pump type Strube.
The locomotives were coupled with type pr 3 T20 tenders .
literature
- Manfred Weisbrod, Hans Müller, Wolfgang Petznick: Steam locomotives of German railways, class 41-59. transpress VEB Verlag for Transport, Berlin 1977, ISBN 3-87094-042-5 .
- Dirk Endisch: 1'D with three cylinders. Class 56.1. In: Lok-Magazin 12/2017, pp. 44–53.
