Baden IV d
| Baden IV d | |
|---|---|
| Numbering: | 124 ... 246 |
| Number: | 14th |
| Manufacturer: | Maffei |
| Year of construction (s): | 1891 |
| Retirement: | 1923/1924 |
| Type : | 1'B1 'n2t |
| Gauge : | 1435 mm ( standard gauge ) |
| Length over buffers: | 11,038 mm |
| Height: | 4150 mm |
| Empty mass: | 43.1 t |
| Service mass: | 53.9 t |
| Friction mass: | 27.4 t |
| Wheel set mass : | 13.7 t |
| Top speed: | 80 km / h |
| Coupling wheel diameter: | 1716 mm |
| Impeller diameter: | 1109 mm |
| Control type : | Heusinger |
| Cylinder diameter: | 457 mm |
| Piston stroke: | 610 mm |
| Boiler overpressure: | 10 bar |
| Number of heating pipes: | 174 |
| Heating pipe length: | 4400 mm |
| Grate area: | 1.75 m² |
| Radiant heating surface: | 7.37 m² |
| Tubular heating surface: | 112.0 m² |
| Evaporation heating surface: | 119.37 m² |
| Water supply: | 6 m³ |
| Fuel supply: | 2.50 tons of coal |
| Brake: | Westinghouse air brake |
The locomotives of type IV d of the Grand Ducal Baden State Railways were passenger train tender locomotives with two coupled axles from 1891. The change to the class 71.70 planned by the Deutsche Reichsbahn in 1925 was no longer carried out because the machines had meanwhile been retired.
history
The class IV b machines converted into tank locomotives were not suitable for use in light express train service. For use on the Black Forest Railway, however, they were looking for a locomotive that could carry such trains over the mountainous route and the subsequent flat routes. For this purpose, the machines should be able to pull a 110-tonne train at 35 km / h on a 2% gradient.
The 14 locomotives supplied by Maffei were unsatisfactory. The sheet travel of the machines was poor and at higher speeds they did not run properly. Therefore, no further locomotives were procured and only three years later they could be replaced on the Black Forest Railway with vehicles of type IV e . Five locomotives were still included in the preliminary re-drawing plan of the Deutsche Reichsbahn as 71 7001 to 7005. It was no longer redesignated because all locomotives were decommissioned by 1925.
Constructive features
The locomotives had an internal sheet metal frame. The long boiler consisted of three shots. A large steam dome sat on the rear and the regulator dome on the front. The standing kettle lay deep between the two frame cheeks. The inlet pipes to the cylinders were on the outside.
The external two-cylinder wet steam engine worked on the rear coupling axle. The Heusinger control was external. The coupling wheels were cushioned by leaf springs underneath. The barrel axles were designed as Adam's axles and could move 23 mm to both sides. Wedge surfaces served as a return device. The leaf springs were located above the axle bearings.
The Westinghouse air brakes braked the front coupling axle from the rear and the rear axle from the front. The sandpit was in the middle of the long bowl and sanded both axes from the front. Four water boxes have been installed for better weight distribution. Two were on both sides of the long boiler at the level of the steam dome and two on the sides of the smoke chamber. The coal supply was arranged on both sides in front of the driver's cab.
literature
- Hermann Lohr, Georg Thielmann: Baden Locomotive Archive (= Railway Vehicle Archive 2, 7) . transpress, Berlin 1988, ISBN 3-344-00210-4 .