SNB Ed 3/4
| Ed 3/4 | |
|---|---|
| Numbering: | SNB 3, 5, 7, 9 |
| Number: | 4th |
| Manufacturer: | SLM |
| Year of construction (s): | 1875 |
| Retirement: | (1880) |
| Axis formula : | 1'C |
| Length over buffers: | 10,590 mm |
| Empty mass: | 31.3 t |
| Service mass: | 41.0 t |
| Friction mass: | 30.0 t |
| Top speed: | 55 km / h |
| Driving wheel diameter: | 1,300 mm |
| Control type : | Walschaert |
| Number of cylinders: | 2 |
| Cylinder diameter: | 420 mm |
| Piston stroke: | 600 mm |
| Boiler overpressure: | 10 bar |
| Number of heating pipes: | 150 |
| Heating pipe length: | 3,712 mm |
| Grate area: | 1.60 m² |
| Evaporation heating surface: | 97.60 m² |
| Water supply: | 5.0 m³ |
| Fuel supply: | 1.3 tons of coal |
| Locomotive brake: | Spindle brake |
The Ed 3/4 of the Swiss National Railroad ( SNB ) is a tender steam locomotive that was procured in 1875. The locomotive was purchased from the Swiss Locomotive and Machine Factory in Winterthur for a purchase price of 59,000 Swiss francs.
It differs from the SNB Eb 3/4 only in the different drive wheel diameters (1300 mm instead of 1600 mm) and the different number of boiler tubes in the otherwise identical boiler. Most of the components were interchangeable among these machines. They were sold to France in 1880, after the railway administration went bankrupt in 1878, and in between they were used by the Swiss Northeastern Railway (NOB).
General
The Moguls tender machine is the first in Switzerland to be delivered from the factory with this wheel alignment. The procurement was preceded by a technical dispute between SLM and the railway department about the supposedly endangered operational safety. For example, radial, displaceable axle sleeves had to be installed on the running axle. However, the result of the construction showed that the fears of the railway department were unfounded. Because the locomotive runs very smoothly, also because it had no overhanging cylinders.
Technical
The tank locomotive built for freight train service has a pulling force of 3300 kg at 45 km / h and 550 hp. The boiler had a steam dome on which the Ramsbottons safety valve was located. The slide regulators were located in the branch pipe in front of the steam dome on which the inlet pipes led down outside were located. The two cylinders were directly below and thus behind the smoke chamber. Between the deeply drawn down inner frame was a large 5 m³ water tank, the filling opening of which was in front of the smoke chamber. The coal supply of 1.3 tons was carried in a box behind the driver's cab. The suspension springs of the barrel axle and the first coupling axle were attached to the frame and connected by tie rods and angle levers. The suspensions of the second coupling axle, which was also the driving axle, and the third coupling axle were suspended under the bearings. The external engine was equipped with a control of the Walschaert type, which was changed over by screw and wheel. The four-block spindle brake acted on the two rear axles. The sandpit was designed as a square box and was located around the steam dome.
| SNB until 1880 |
Factory number |
Construction year | Manufacturer | Discarded | Remarks |
|---|---|---|---|---|---|
| 3 | 70 | 1875 | SLM | 1880 | Sale to France |
| 5 | 78 | 1875 | SLM | 1880 | Sale to France |
| 7th | 80 | 1875 | SLM | 1880 | Sale to France |
| 9 | 82 | 1875 | SLM | 1880 | Sale to France |
swell
- Alfred Mosel: The steam operation of the Swiss railways 1847–1966 . Birkhäuser, Basel, pp. 106ff.