JS A 3/5
| JS A 3/5 | |
|---|---|
 SBB Historic A 3/5 705
|
|
| Numbering: | JS 231 + 232 SBB 701-811 |
| Number: | 111 |
| Manufacturer: | SLM Winterthur |
| Year of construction (s): | 1902-1909 |
| Retirement: | 1926-1964 |
| Type : | 2'C n4v |
| Length over buffers: | 18,600 mm |
| Height: | 4400 mm |
| Service mass: | 106-107 tons |
| Top speed: | 100 km / h |
| Indexed performance : | 1000 kW |
The Jura-Simplon Railway ( JS ) ordered shortly before the takeover by the Swiss Federal Railways an express steam locomotive type (SBB) A 3/5 .
General
The A 3/5 was originally ordered by the Jura-Simplon-Bahn (JS), but only the first two machines were delivered to the JS in 1902. After the nationalization in 1903, the SBB took over these from the Jura-Simplon-Bahn and ordered over a hundred locomotives themselves. A total of 111 copies were built.
In 1907, two machines were factory-fitted with a bread tank. They were classified as 651 and 652 on delivery and were renumbered 810 and 811 in 1913.
The A 3/5 had driving wheels with a diameter of 1780 mm and had a maximum boiler pressure of 15 bar. They achieved a top speed of 100 km / h, which was high for Swiss standards at the time.
The locomotives had a wet steam four-cylinder compound engine, which became technically obsolete during the delivery period due to the introduction of overheating in steam locomotive construction. Due to their reliability, they were still purchased in large numbers until 1909. The two pilot series of the successors equipped with superheaters, the SBB A 3/5 501–502 and SBB A 3/5 601–649 , did not appear until 1907. The series version of the SBB A 3/5 601–649 was then built from 1910 onwards.
Technical
Between 1913 and 1923, 68 locomotives were retrofitted with a Schmidt superheater . It had 21 superheater elements in 22 machines and 24 in 46 machines. No major changes were made to the machine, only the HP slides were replaced by those made of phosphor bronze with improved lubrication.
Operational
The A 3/5 is next to the Gotthard locomotive C 5/6 the best known SBB steam locomotive. Today only number 705 remains. In the meantime, this locomotive consists largely of components from other numbers of this type, as it received the boiler of locomotive 739 in 1953 and the underframe of locomotive 778 in 1963. It belongs to the SBB Historic Heritage Foundation and is operational.
See also
literature
- Alfred Moser : The steam operation of the Swiss railways 1847-1966. 4th updated edition. Birkhäuser, Stuttgart 1967, p. 240ff.