Baden VIII a
| Baden VIII a | |
|---|---|
 Genus VIIIa
|
|
| Numbering: | 344-355 |
| Number: | 12 |
| Manufacturer: | Hanomag |
| Year of construction (s): | 1875 |
| Retirement: | until 1925 |
| Type : | D n2 |
| Gauge : | 1435 mm ( standard gauge ) |
| Length over buffers: | 15,682 mm |
| Height: | 4400 mm |
| Total wheelbase: | 2924 mm |
| Wheelbase with tender: | 10155 mm |
| Empty mass: | 45.6 t |
| Service mass: | 52.4 t |
| Friction mass: | 52.4 t |
| Wheel set mass : | 12.9 t |
| Top speed: | 45 km / h |
| Coupling wheel diameter: | 1,220 mm |
| Control type : | Allan |
| Number of cylinders: | 2 |
| Cylinder diameter: | 530 mm |
| Piston stroke: | 635 mm |
| Boiler overpressure: | 9 bar |
| Number of heating pipes: | 237 |
| Heating pipe length: | 5060 mm |
| Grate area: | 2.00 m² |
| Radiant heating surface: | 8.20 m² |
| Tubular heating surface: | 173.30 m² |
| Evaporation heating surface: | 181.50 m² |
| Tender: | 3 T 11.5 |
| Water supply: | 11.5 m³ |
| Locomotive brake: | Screw brake on the tender |
The steam locomotives of the class VIIIa were freight locomotives of the Grand Ducal Baden State Railways .
For use on the Black Forest Railway and the routes in the Odenwald with a gradient of up to 12 ‰, more powerful locomotives were required because the triple-coupled locomotives of classes VII a and VII b were reaching their performance limits.
Therefore, twelve quadruple-coupled locomotives were ordered from Hanomag . In order to achieve good driving behavior on the winding roads, the four axles were moved close together, but the last axle had to be given a bit of side play.
Although the locomotives met the expectations placed in them, no replicas were made. The use of compound drives in connection with separate wheel groups made it possible to construct machines with better curvature. All locomotives were decommissioned by 1923.
Constructive features
The locomotives had an internal sheet metal frame. The large steam dome sat on the front boiler section of the long boiler and had a spring balance safety valve. The fire box had a smooth outer wall and a grate width of 1.33 m was achieved. In order to achieve the necessary grate area of 2 m², the grate only needs to be 1.5 m long. With a pipe length of 5.06 m, the machines had the longest boiler in Germany at the time.
The two-cylinder wet steam engine with internal Allan controls was arranged horizontally and externally. The piston rods reached through the front cylinder cover for the first time in a Baden locomotive. The drive took place on the third coupling axle.
The suspension was provided by leaf springs located above the axle bearings which were connected to compensating levers. Initially, the locomotives had a drum sandpit that sanded the first coupled axle. This was replaced by a sandpit in the middle of the long basin, which sanded the third axis.
Fitted were the locomotives with a tender senders of the type 3 11.5 T 3 or T 7.29.
literature
- Hermann Lohr, Georg Thielmann: Baden locomotive archive . transpress, Berlin 1988, ISBN 3344002104