LKM type 225 PS narrow gauge
| LKM type 225 PS narrow-gauge DR series 99.33 |
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| Numbering: | DR: 99 333 | DR: 99 331, 99 332 DR: 99 2331-9, 99 2332-7 DB: 099 904-5, 099 905-2 MBB: like DR |
| Number: | 21st | 2 |
| Manufacturer : | VEB Lokomotivbau Karl Marx | Raw Görlitz |
| Year of construction (s): | 1950-1952 | 1961 (renovation) |
| Retirement: | until 1968 | |
| Axis formula : | D n2t | D h2t |
| Genre : | K 44.8 | |
| Gauge : | 900 mm | |
| Length over coupling: | 8860 mm | |
| Height: | 3490 mm | |
| Total wheelbase: | 3000 mm | |
| Empty mass: | 24.8 t | 25.0 t |
| Service mass: | 32.0 t | 32.4 t |
| Friction mass: | 32.0 t | 32.4 t |
| Wheel set mass : | 8.0 t | 8.1 t |
| Top speed: | 35 km / h | |
| Indexed performance: | 460 PSi | |
| Starting tractive effort: | 56.39 kN | |
| Coupling wheel diameter: | 800 mm | |
| Control type : | Heusinger | |
| Number of cylinders: | 2 | |
| Cylinder diameter: | 370 mm | |
| Piston stroke: | 400 mm | |
| Boiler overpressure: | 14 bar | |
| Number of heating pipes: | 150 | 9 |
| Number of smoke tubes: | 64 | |
| Heating pipe length: | 2600 mm | |
| Grate area: | 1.6 m² | |
| Radiant heating surface: | 6.04 m² | |
| Tubular heating surface: | 48.4 m² | 36.85 m² |
| Superheater area : | 18 m² | |
| Evaporation heating surface: | 54.8 m² | 42.89 m² |
| Water supply: | 3.4 m³ | |
| Fuel supply: | 2.2 tons of coal | |
The vehicles of the type 225 HP narrow gauge of VEB Lokomotivbau Karl Marx were developed based on a range of types for smaller steam locomotives especially for use in industrial companies. Three of the locomotives were acquired by the Deutsche Reichsbahn in 1958 . The locomotives used on the Molli bathing railway between Bad Doberan and Kühlungsborn West were given the class designation 99.33 .
history
Based on a type program for smaller steam locomotives for gauges from 750 mm to 1524 mm that was created by Lokomotivbau Karl Marx in the late 1940s, the company developed a four-coupled wet steam locomotive for a gauge of 900 mm. In 1950 ten locomotives with the serial numbers 16501 to 16511 were manufactured. In 1951/1952 another eleven locomotives with the serial numbers 30011 to 30021 followed. The locomotives went to SDAG Wismut , to the metalworking industry and to the lignite power station Freund in Lauchhammer.
At the end of the 1950s, the Reichsbahn felt compelled to replace the 27-year-old class 99.31 locomotives . A replica of the 99.32 series was not possible. The Reichsbahn acquired three locomotives from SDAG Wismut. In April / May 1959 the 99 331 (formerly No. 22) and the 99 332 (No. 44) and in December 1960 99 333 (No. 1) were put into service after adjustment work in the Görlitz Reichsbahn repair shop. In 1961 the 99 331 and 99 332 were converted to superheated steam. The 99 333 remained a wet steam locomotive and was only a reserve engine from the mid-1960s. With the cessation of freight traffic on the line, not so many locomotives were needed, so that it was retired in 1968.
The two remaining machines were redesignated in 1970 as 99 2331-9 and 99 2332-7. The locomotives were only used as a reserve. There were special timetables for them, as their maximum speed is only 35 km / h, but the timetables were designed for a line speed of 40 km / h. In the less tight winter schedule, they were to be found more frequently on the schedule. Due to the lack of running axles, they are more secure against derailment. One of the locomotives was always fitted with an add-on snow plow in winter.
With the introduction of the DB numbering scheme, the locomotives were given the operating numbers 099 904-5 and 099 905-2 on January 1, 1992. With the takeover of operations on the route by Mecklenburgische Bäderbahn Molli GmbH & Co. KG on October 1, 1995, the two locomotives were also taken over and given their previous numbers.
With the takeover, a new operating concept was introduced that made it no longer necessary to maintain two locomotives. The 99 2332 was therefore parked in December 1995 and has been exhibited in the Molli Museum in front of the Kühlungsborn West train station since 1997. The 99 2331 is used in the summer schedule as a reserve and special locomotive due to the restrictions on the maximum speed and the schedule design; in the winter schedule it is used in normal train service. The add-on snow plow was last used in 1996.
Constructive features
The locomotives have a welded sheet metal frame. The steam dome with the Schmidt & Wagner wet steam regulator sits at the front of the welded long boiler. The sandpit and two boiler safety valves of the Ackermann type are located on the rear part. In 1961 the 99 331 and 99 332 were converted to superheated steam. The boilers each received nine heating and 64 smoke tubes. The horizontally arranged two-cylinder engine on the outside acts on the third coupling axle. The Heusinger control on the outside has a greatly simplified Kuhn loop .
For the train lighting, the locomotives received a more powerful 5 kW turbo generator behind the chimney during the adaptation work of the Deutsche Reichsbahn. The original handbrake was supplemented by a Knorr compressed air brake. The two-stage air pump is located to the right of the smoke chamber . As usual on the bathing railway, the locomotives received a Knorr compressed air bell. The first set of wheels is sent from the front and the last set of wheels from the rear.
For use on the pool runway, the upper part of the driver's cab was heavily bevelled in order to adapt it to the clearance profile . The roof received lateral rain gutters with drainage pipes. The welded water tanks are located in front of the driver's cab on both sides of the boiler and hold 3.4 m³. The coal box is located on the rear wall of the driver's cab and, as it was designed for lignite briquette combustion, was originally enlarged with a structure that was drawn in between the two windows in the rear wall up to the level of the roof. It had a capacity of 2.2 t. Since coal is now being fired and the coal box could not be completely filled with its higher specific weight, this structure was removed from 99 2331 during the main inspection in the Meiningen steam locomotive works in 2004 to improve visibility when reversing. As a result, its capacity was reduced to 1.5 t. The museum locomotive 99 2332 still has the original structure.
literature
- Horst J. Obermayer: Paperback German narrow-gauge steam locomotives . Franckh, Stuttgart 1971, ISBN 3-440-03818-1 .
- Manfred Weisbrod, Hans Wiegard, Hans Müller, Wolfgang Petznick: German Locomotive Archive: Steam Locomotives 4 (Class 99) . transpress, Berlin 1995, ISBN 3-344-70903-8 .