DR series 99.32
| DR series 99.32 | |
|---|---|
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| Numbering: | DR: 99 321–99 323 from 1970: 99 2321–2323 DB: 099 901–903 MBB: 99 2321–2324 |
| Number: | 4th |
| Manufacturer: | Orenstein & Koppel , DLW Meiningen |
| Year of construction (s): | 1932, 2008 |
| Type : | 1'D1 'h2t |
| Genre : | K 46.8 |
| Gauge : | 900 mm |
| Length over buffers: | 10,595 mm |
| Height: | 3,400 mm |
| Total wheelbase: | 8,075 mm |
| Empty mass: | 35.15 t |
| Service mass: | 43.68 t |
| Friction mass: | 31.80 t |
| Wheel set mass : | 7.95 t |
| Top speed: | 50 km / h |
| Indexed performance : | 460 PSi / 338 kW |
| Starting tractive effort: | 59.33 kN |
| Coupling wheel diameter: | 1100 mm |
| Impeller diameter front: | 550 mm |
| Rear wheel diameter: | 550 mm |
| Control type : | Heusinger on the outside |
| Number of cylinders: | 2 |
| Cylinder diameter: | 380 mm |
| Piston stroke: | 550 mm |
| Boiler overpressure: | 14 bar |
| Number of heating pipes: | 4th |
| Number of smoke tubes: | 69 |
| Heating pipe length: | 3,500 mm |
| Grate area: | 1.60 m² |
| Radiant heating surface: | 5.80 m² |
| Tubular heating surface: | 54.74 m² |
| Superheater area : | 30.60 m² |
| Evaporation heating surface: | 60.54 m² |
| Water supply: | 4.25 m³ |
| Fuel supply: | 1.7 tons of coal |
| Locomotive brake: | Knorr two-chamber air brake |
| Train heating: | steam |
The vehicles of the series 99.32 of the Deutsche Reichsbahn are narrow-gauge locomotives built according to the standard principles for a track width of 900 mm.
The three locomotives procured in 1932 for the Bad Doberan – Kühlungsborn bathing railway are still in use today and will be supplemented by a locomotive reproduced in 2009.
history
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The increasing volume of traffic on the railway line between Bad Doberan and Kühlungsborn pushed the class 99.31 locomotives purchased in 1923 to their limits. The Deutsche Reichsbahn therefore ordered three 1'D1 'h2 locomotives from Orenstein & Koppel to expand the vehicle fleet. In doing so, the company should orient itself towards the construction principles and standards of the standard locomotives when designing . Originally, the locomotives were not included in the type range. However, the use of many standardized assemblies allows the term standard locomotive to be used.
The locomotives were delivered in 1932. To shorten the travel time, the vehicles were designed for a speed of 50 km / h. This makes them the only German narrow-gauge steam locomotives with such a top speed alongside NWE No. 21 .
With the introduction of the EDP numbers, the locomotives received the new locomotive numbers 99 2321-0, 99 2322-8 and 99 2323-6 in 1970. In the mid-1970s, the 99 2322 and 99 2323 received welded steel cylinders instead of the worn gray cast iron cylinders. The 99 2321 was exchanged at the end of the 1980s. With the introduction of the numbering scheme of the Deutsche Bundesbahn on January 1, 1992, the locomotives were given the operating numbers 099 901-1, 099 902-9 and 099 903-7. When the Mecklenburgische Bäderbahn Molli GmbH & Co. KG took over operations on October 1, 1995, the locomotives came to this company and were given their previous EDP numbers back.
Between 1994 and 1997 all locomotives in the Meiningen steam locomotive plant were given a general overhaul. The locomotives received welded boilers, new water tanks and wheel tires. During the main inspection between 2003 and 2006, the locomotives received new welded sheet metal frames. Roller axle bearings were tested on the 99 2322-6 from 2003 to 2006. However, these did not prove themselves.
Since the still operational class 99.33 locomotive did not meet the requirements of the summer schedule, but a further powerful locomotive was needed, it was decided to build a class 99.32 locomotive based on the previous design improvements. The locomotive 99 2324-4 manufactured in the Meiningen steam locomotive works entered service in 2009.
Constructive features
Deviating from the construction principles of the standard locomotives, the locomotives had a riveted sheet metal frame with longitudinal and transverse reinforcements instead of a bar frame. Since the general inspection carried out from 2003 to 2006, the locomotives have had a welded sheet metal frame.
The riveted long shell consists of two sections. The steam dome with the Schmidt & Wagner wet steam regulator sits on the second shot, while the sandpit sits on the first. The separate steam collecting box for wet and superheated steam is located in the smoke chamber. An unusual tube mirror is used for the flue tube superheater. Four heating pipes face 69 smoke pipes. The Ackermann safety valves are located on the top of the standing boiler. From 1994 to 1997 the locomotives received newly designed welded steel boilers.
The external, horizontally arranged two-cylinder superheated steam engine works on the third coupling axis. The original gray cast iron cylinders were replaced by welded steel cylinders from the mid-1970s. The external Heusinger control has a Kuhn loop. The original control piston valves were later replaced by Müller pressure compensation piston valves. Today, Görlitz type Trofimoff valves are used.
The drive is supported at four points. The leaf spring assemblies of the coupled gear sets are below the axle bearings. The wheel sets are cushioned above the axle bearings. The springs of the two outer wheel sets and the adjacent wheel set are each connected by compensating levers. The wheel sets are designed as Bissel axles with 20 mm lateral displacement. The third coupled axle has a wheel flange weakened.
A Knorr two-chamber air brake is used as the locomotive brake. All coupling wheels are braked from the front. The air pump is located to the right of the smoke chamber. The air tanks are located on both sides under the rear water tank.
The Borsig compressed air sanding device sands the first two wheelsets when driving forward and the second and third axles when driving backwards. To make the train journey more secure, the machines had a Knorr compressed air bell in front of the chimney and on the coal box. Due to noise complaints from residents when passing through Bad Doberan, the rear bell was later removed. A steam turbine generator behind the chimney generates an output of 5 kW at 85 V. The locomotive has a steam heating system.
The boiler water is housed in water boxes in front of the driver's cab along the long boiler. The coal supply is in a coal box behind the driver's cab.
Due to the restricted clearance profile , the upper part of the driver's cab had to be bevelled heavily.
literature
- Manfred Weisbrod, Hans Wiegard, Hans Müller, Wolfgang Petznick: German Locomotive Archive: Steam Locomotives 4 (Class 99) . transpress, Berlin 1995, ISBN 3-344-70903-8 .
- Horst J. Obermayer: Paperback German narrow-gauge steam locomotives . Franckh, Stuttgart 1971, ISBN 3-440-03818-1 .
- Klaus Kieper, Reiner Preuß: Narrow Gauge Railway Archive . transpress VEB publishing house for transport, Berlin 1980.
