DR series 71.0
| DR series 71.0 | |
|---|---|
| Numbering: | 71 001-006 |
| Number: | 6th |
| Manufacturer: | Schwartzkopff , Borsig , Krupp |
| Year of construction (s): | 1934-1936 |
| Retirement: | 1956 |
| Type : | 1'B1 'h2t |
| Genre : | Pt 24.15 |
| Gauge : | 1435 mm ( standard gauge ) |
| Length over buffers: | 11,800 mm |
| Height: | 4,165 mm |
| Fixed wheelbase: | 3,000 mm |
| Total wheelbase: | 8,400 mm |
| Service mass: | 58.6 t |
| Friction mass: | 30.0 t |
| Wheel set mass : | 15.0 t |
| Top speed: | 90 km / h / 100 km / h |
| Indexed performance : | 419 kW |
| Driving wheel diameter: | 1,500 mm / 1,600 mm |
| Impeller diameter front: | 850 mm |
| Rear wheel diameter: | 850 mm |
| Control type : | Heusinger |
| Number of cylinders: | 2 |
| Cylinder diameter: | 310 mm / 330 mm |
| Piston stroke: | 660 mm |
| Boiler overpressure: | 20 bar |
| Number of heating pipes: | 70 |
| Number of smoke tubes: | 26th |
| Heating pipe length: | 3,500 mm |
| Grate area: | 1.38 m² |
| Superheater area : | 28.60 m² |
| Evaporation heating surface: | 67.74 m² |
The DR class 71.0 was a double-coupled tank locomotive that was intended to compete with the railcars of the Deutsche Reichsbahn . The omnibus and the growing individual traffic on the road should also be confronted with competition. The main task of these standard steam locomotives was to transport passenger trains on short branch lines .
history
Two of the steam locomotives were built in 1934 by the Schwartzkopff company and delivered to the Grunewald Locomotive Research Office . They were tested there until May 1935. It turned out that the consumption values compared to other steam locomotives of the Reichsbahn had not decreased as hoped. Then in 1936 the companies Borsig and Krupp built two more locomotives each, with the drive wheels enlarged to 1,600 mm and the cylinder diameter to 330 mm. These locomotives had a top speed of 100 km / h.
First all machines came to the Bamberg depot . There they were used on the Forchheim-Behringersmühle , Bamberg-Maroldsweisach and Bamberg-Scheßlitz routes. However, their performances were not convincing. Therefore, in 1938, they were relocated to the Nürnberg Hbf depot , today the Nürnberg West depot . There they were mostly deployed or parked in front of work trains . Occasionally they are said to have driven on the Nuremberg - Feucht - Wendelstein route . In 1948 none of the six locomotives were in service.
The German Federal Railroad took over all vehicles after the Second World War . In 1952 they received a general inspection at the Kaiserslautern repair shop . They were then located in the Kaiserslautern and Landau depots. The tank locomotives achieved daily mileages of approx. 340 km on routes in the Palatinate. By August 1956, all class 71.0 locomotives were retired. No copy has survived.
technology
All six locomotives were two-cylinder superheated steam engines and had an automatic grate loading system ( stoker ) for one-man operation. The boiler was riveted and consisted of one shot . It was made of lightly alloyed molybdenum steel and had a diameter of 1300 mm. The welded firebox was made of copper. During the service, the boiler pressure was reduced from 20 bar to 16 bar for safety reasons. In front of the chimney, the transverse surface preheater was located in a niche on the top of the boiler. The lighting generator was installed after the chimney . The locomotives had a piston feed pump and a steam jet pump with an output of 125 liters per minute each.
All locomotives had a welded sheet metal frame made of 16 mm plates. The second coupled axle was driven. Both coupling axles were fixed in the frame. The structure of the locomotives was supported in four points. The wheels were housed in Bissel racks and had a clearance of 65 mm on both sides. Their symmetrical arrangement made it possible to achieve the same running characteristics for both directions of travel.
The locomotives built in 1934 had a coal supply of 3 t, the locomotives built later only had 2.8 t. Block brakes acted on all wheels on both sides. The two water tanks on the sides of the kettle were kept narrow. There was a third water tank in the middle of the frame between the coupling axles. The water boxes, the storage tank for coal and the top of the sandpit were welded.
literature
- Josef Brandt: Class 64. The famous bob haircut . Verlagsgruppe Weltbild, Augsburg 2008, DNB 991518128 Chapter The 71 series, the little sisters
- Locomotive portrait - Class 71.0 of the former Deutsche Reichsbahn . In: Horst J. Obermayer (Ed.): Lok-Magazin . No. 130 . Franckh'sche Verlagshandlung, W. Keller & Co. , 1985, ISSN 0458-1822 , p. 52-55 .
- Manfred Weisbrod, Horst J. Obermayer: Railway Journal Archive VI / 1997 Steam Locomotive Report Volume 5 . Hermann Merker Verlag GmbH, Fürstenfeldbruck 1994, ISBN 3-89610-022-X , p. 33 ff .