DR series 99.31
| Mecklenburg T 42 DR class 99.31 |
|
|---|---|
| Numbering: | 99 311-313 |
| Number: | 3 |
| Manufacturer: | Henschel |
| Year of construction (s): | 1923-1924 |
| Retirement: | 1961 |
| Type : | D n2t |
| Genre : | K 44.8 |
| Gauge : | 900 mm |
| Length over buffers: | 7,900 mm |
| Height: | 3,400 mm |
| Width: | 2,400 mm |
| Total wheelbase: | 3,400 mm |
| Empty mass: | 25.45 t |
| Service mass: | 31.9 t |
| Friction mass: | 31.9 t |
| Wheel set mass : | 8.0 t |
| Top speed: | 30 km / h |
| Indexed performance : | 210 PS / 154 kW |
| Starting tractive effort: | 41.67 kN |
| Driving wheel diameter: | 830 mm |
| Control type : | Heusinger |
| Number of cylinders: | 2 |
| Cylinder diameter: | 350 mm |
| Piston stroke: | 400 mm |
| Boiler overpressure: | 12 bar |
| Number of heating pipes: | 112 |
| Heating pipe length: | 3100 mm |
| Grate area: | 1.1 m² |
| Radiant heating surface: | 4.87 m² |
| Tubular heating surface: | 45.14 m² |
| Evaporation heating surface: | 50.01 m² |
| Water supply: | 3.5 m³ |
| Fuel supply: | 1.5 tons of coal |
The vehicles of the 99.31 series were narrow-gauge locomotives with a gauge of 900 mm for the Deutsche Reichsbahn for the Bäderbahn between Bad Doberan and Arendsee . The machines delivered in 1923 were known as T 42s until the series designation was introduced.
history
The T 7 locomotives delivered in 1910 could no longer cope with the increasing volume of traffic after the First World War . The Deutsche Reichsbahn therefore ordered three quadruple-coupled tank locomotives from Henschel & Sohn to replace them . The first two machines were delivered in 1923 and the third in 1924. In contrast to their predecessors, the locomotives did not have the engine cowling from the start.
The 99 311 was awarded to the Rostock company Ratjens in 1942. Through this the locomotive came to Denmark, where it was scrapped after 1945. The two other machines were in use alongside the 99.32 locomotives until they were replaced in 1961 by the 99.33 locomotives . Then they were handed over to the Rostock construction union as heating locomotives.
Constructive features
The locomotives had a riveted sheet metal inner frame made of 16 mm thick sheets of 7260 mm length. The frame was also used as a water tank.
The riveted long shell consists of one shot. The standing kettle has a semicircular ceiling. Directly behind the chimney sat the large round dining dome. The steam dome was at the end of the long boiler. The square sandpit sat between the two domes. The chimney had a pebble to prevent flying sparks when driving through streets.
The two-cylinder wet steam engine was external and worked on the third coupled axle. The external Heusinger control had a hanging iron and a flat slide. The reversal was carried out by control spindles.
The drive was supported at four points. The first two coupling axles had leaf spring packages on the upper edge of the frame. In the two rear locomotives, the spring assemblies lay over the axle box. The springs of the two sets of wheels were each connected to a compensating lever . The last set of wheels had a lateral displacement of 12.5 mm on both sides.
The locomotives were equipped with the rarely used two-chamber air brakes from Knorr. All wheelsets were braked from the front. The air tanks were located under the driver's cab and the air pump on the right circulating plate in front of the water tank.
The sand spreader sanded the third axle (driving axle) when driving forwards and the first axle when driving backwards. The locomotive had a steam heating device. To make it easier for the staff, the locomotives had a steam bell at each end of the locomotive instead of a hand bell.
The water was housed in two water tanks arranged next to the boiler in front of the driver's cab and a frame water tank. The coal box was behind the driver's cab. The roof of the driver's cab was straight and rounded.
literature
- Horst J. Obermayer: Paperback German narrow-gauge steam locomotives. Franckh, Stuttgart 1971, ISBN 3-440-03818-1
- Hans-Joachim Kirsche, Hermann Lohr, Georg Thielmann: Lokomotiv-Archiv Mecklenburg / Oldenburg . transpress, Berlin 1989, ISBN 3-344-00326-7 .