VSB Ed 4/4
| VSB Ed 4/4 | |
|---|---|
 |
|
| Numbering: | VSB 61-64 SBB 7591-7594 |
| Number: | 4th |
| Manufacturer: | Hartmann |
| Year of construction (s): | 1876-77 |
| Retirement: | 1908-1925 |
| Axis formula : | D. |
| Length over buffers: | 9,781 mm |
| Service mass: | 55 t |
| Wheel set mass : | 12.5 t |
| Top speed: | 45 km / h |
| Installed capacity: | 480 kW |
| Starting tractive effort: | 65.7 kN |
| Driving wheel diameter: | 1,210 mm |
| Cylinder diameter: | 500 mm |
| Piston stroke: | 540 mm |
| Boiler overpressure: | 12 kgf / cm² |
| Grate area: | 2.0 m² 1.9 m² 1 |
| Evaporation heating surface: | 154.4 m² 147.5–150.3 m² (2nd boiler) |
| Brake: |
External brake from 1892-95 autom. Westinghouse brake |
The four Ed 4/4 tank locomotives were bought by the United Swiss Railways (VSB) between 1876 and 1877 . At first they had the series designation IV, from 1887 to 1902 they were called D4.
The Ed 4/4 were built by the Sächsische Maschinenfabrik in Chemnitz. They were the first locomotives in Switzerland to be procured as four-axle tank locomotives.
construction
The machines were based on a design by Adolf Klose . The undercarriage rested in an inner frame in which a water tank was also installed.
When delivered, the boiler surpassed all previous steam locomotives in Switzerland with 154 m² heating surface. Its position of 2325 mm above the top of the rail was also exceptional. This enabled the fire box to be built over the axles.
Due to the compact overall wheelbase of only 4000 mm, the overall length of 9780 mm resulted in a relatively large front and rear overhang. The first three axles had suspension springs above the frame, with balance levers mounted between axles 2 and 3, while the rearmost axle had two transverse springs at axle height. There were two spring-loaded safety valves on the steam dome. The slide regulators were built into the dome and operated using horizontal-vertical angle levers on the rear wall of the boiler. The third axis was designed as a drive axis. The control was based on Walschaerts with a straight backdrop to Klose, the reversal was carried out with screw and wheel.
The sandpit was built outside the frame in front of the drive axis.
After the fire boxes were renewed in 1883, the next major renovation was in 1892–95, when the locomotives were equipped with an automatic Westinghouse brake. This acted on the locomotive and the wagons. In addition, the locomotives received a Klose speedometer in 1879 and grease gas lighting in 1881.
The locomotives could carry 6.5 m³ of water and 2 tons of coal as supplies.
| VSB number |
SBB number |
Surname | Factory number |
Construction year | 2nd boiler | Out of service |
|---|---|---|---|---|---|---|
| 61 | 7591 | Albula | 934 | 1876 | 1902 | 1913 |
| 62 | 7592 | Fluela | 935 | 1876 | 1905 | 1922 |
| 63 | 7593 | Bernina | 973 | 1877 | 1904 | 1925 |
| 64 | 7594 | Silvretta | 974 | 1877 | 1898 | 1908 |
commitment
The two locomotives were purchased to replace the two Ec 2/5 tender locomotives (type Engerth) that had been converted in 1874 and whose performance was no longer sufficient for the Rorschach - St. Gallen prestressing service. The home workshop of the machines was always Rorschach, and at SBB they were also assigned to SBB District IV.
The numbers 7592 and 7593 were active in the years 1913–1915 on the discharge hill of the Basel freight yard. The two machines were then used in District III. Number 7591 was rented to the Jura neuchâtelois between 1912 and 1913 .
swell
- The steam operation of the Swiss railways 1847–1966 (Moser book) p.126ff