NOB D 2/2
| D 2/2 | |
|---|---|
 “Reppisch” locomotive No. 36 in Zurich main station
|
|
| Numbering: | NOB 34-39 |
| Number: | 6th |
| Manufacturer: | Escher Wyss , Esslingen |
| Year of construction (s): | 1861, 1863 |
| Retirement: | 1876-1878 |
| Axis formula : | B. |
| Gauge : | 1435 mm ( standard gauge ) |
| Length over buffers: | 12 770 m |
| Empty mass: | 36.5 t |
| Service mass: | 32.0 t |
| Service mass with tender: | 52.0 t |
| Friction mass: | 26.0 t |
| Top speed: | 40 km / h |
| Coupling wheel diameter: | 1370 mm |
| Driving wheel diameter: | 1,370 mm |
| Control type : | from Gooch |
| Number of cylinders: | 2 |
| Cylinder diameter: | 431 mm |
| Piston stroke: | 686 mm |
| Boiler overpressure: | 10 |
| Number of heating pipes: | 204 |
| Heating pipe length: | 3740 mm |
| Grate area: | 1.40 m² |
| Superheater area : | no |
| Evaporation heating surface: | 106.20 m² |
| Tender: | Supporting Beugniot 3 axes |
| Water supply: | 9.3 m³ |
| Fuel supply: | 2.5 tons of coal |
| Locomotive brake: | Spindle brake (tender) |
| Train control : | no |
The steam locomotives D 2/2 of the Swiss Northeast Railway were procured between 1861 and 1863. The last four machines were intended for the Zurich-Zug-Lucerne railway . These are freight locomotives with a support tender based on the Beugniot system .
Technical
Since only 26 tons were carried by the drive axles with a service weight of 32 tons, the three-axle tender had to take on a load of 6 tons. The tender was a support tender based on the Beugniot system. The connection to the locomotive was designed to be very flexible, which was prone to overloading. In order to avoid spring breakage, additional reinforcements had to be attached. Due to the high axle pressure and the weak track superstructure, the machines tended to nod . That is why the springs of the drive axles of the four machines supplied by Esslingen were connected with longitudinal levers. This measure could not be described as successful, because the nod was accompanied by a swaying movement. So it is not surprising that the top speed was limited to 40 km / h. The machines of the two manufacturers hardly differed, the main dimensions were the same.
The locomotives had an outer frame. The boiler had a steam collecting pipe instead of the steam dome. The spring safety valve was on the manhole cover above the fire box. The drive mechanism was arranged outside the frame so that the lateral cylinder spacing was 2400 mm. The drive cranks were designed according to the Hall design with shortened long neck cranks. For the first time, the coupling rods were arranged within the drive rods. Since the rear drive axle was designed as a coupling axle, there were advantageous long drive and control rods. In addition to a rather large cylinder diameter of 431 mm, there was also the long piston stroke of 686 mm. This was the longest piston stroke ever used on a Swiss steam locomotive. The control system based on the Gooch design, which is rare in Switzerland, was arranged within the frame. Because of the inner frame controls, there were long steam lines. The slide pushrods also had to be guided around the front axle in an arc. The sliders were vertical. The locomotives only had a spindle brake, which was on the stoker's side and acted on the tender axles. The tender was a three-axle outer frame tender with springs above the axles. He could carry 9.3 m³ of water and 2.5 tons of coal.
| NOB | Surname | Factory number |
Construction year | Manufacturer | Discarded | Remarks |
|---|---|---|---|---|---|---|
| 34 | Smooth | 20th | 1861 | Escher Wyss | 1876 | |
| 35 | Suhr | 21st | 1861 | Escher Wyss | 1878 | |
| 36 | Reppisch | 617 | 1863 | Esslingen | 1876 | |
| 37 | Lorze | 618 | 1863 | Esslingen | 1878 | |
| 38 | Rigi | 619 | 1863 | Esslingen | 1878 | |
| 39 | Pilate | 620 | 1863 | Esslingen | 1878 |
The machines delivered by Escher Wyss in 1861 cost 65,000 Swiss francs each. The purchase price of the four machines delivered by Maschinenfabrik Esslingen in 1863 was quoted at 61,254 Swiss francs.
Operational
Since the locomotives ran anything but quiet due to their high axle pressure, they were only in service for 15 years - even though they were considered strong and fuel-efficient.
swell
- The steam operation of the Swiss Railways 1847–1966 (Moser Buch) p. 86 ff