LFB Ec 2/4
| LFB Ec 2/4 | |
|---|---|
 |
|
| Numbering: | LFB: 1-12 SO / SOS: 51-62 JS: 251-262 |
| Number: | 12 |
| Manufacturer: | Esslingen |
| Year of construction (s): | 1862 |
| Retirement: | 1895-1905 |
| Axis formula : | 2 B |
| Gauge : | 1435 mm ( standard gauge ) |
| Length over buffers: | 10 120 mm |
| Fixed wheelbase: | 1890 mm |
| Total wheelbase: | 6090 mm |
| Empty mass: | 32.0 t |
| Service mass: | 41.0 t |
| Friction mass: | 27.0 t |
| Top speed: | 60 km / h |
| Driving wheel diameter: | 1374 mm |
| Number of cylinders: | 2 |
| Cylinder diameter: | 410 mm |
| Piston stroke: | 612 mm |
| Boiler overpressure: | 8 atü |
| Number of heating pipes: | 150 |
| Heating pipe length: | 4050 mm |
| Grate area: | 1.2 m² |
| Radiant heating surface: | 6.6 m² |
| Evaporation heating surface: | 103.8 m² |
| Water supply: | 4.0 m³ |
| Fuel supply: | 2.7 tons of coal |
The Lausanne – Friborg – Bern Railway ( LFB ) purchased twelve tank locomotives of the type Ec 2/4 in 1862 , which were designed as mixed -train locomotives . They were supplied by the Esslingen machine factory.
technology
The tank locomotives delivered in 1862 with the 2'B wheel arrangement were a novelty for Switzerland. The Nordostbahn (NOB) also used locomotives with a 2'B wheel arrangement in various designs for all types of trains, but these machines all had a tender . The type A2 tank locomotives proved their worth on routes that were not too long and with a maximum gradient of 12 ‰. The saddle-shaped water tank above the steam boiler gave the machines a special look. The weight of the coal and water supplies led to a welcome increase in adhesion .
The wheelbase of the Esslingen tender machines was 6090 mm larger than that of the NOB B 2/4 passenger locomotive with 4710 mm. This meant that a larger part of the locomotive's weight was on the drive axles and could be used for adhesion. This also avoids the front overhang of the frame, the boiler and the cylinders. The LFB tender machines achieved an adhesion weight of 27 t, in contrast to 14 to 17.5 t of the NOB tender locomotives. However, the higher axle load required a correspondingly better track superstructure .
By enlarging the bogie axle stand, the guidance and running of the locomotive were improved, so that the stress on the track was reduced and therefore the driving speed could be increased. The larger bogie axle base was less of a limitation when it came to the design of the boiler. In LFB's 2'B tank locomotives, the cylinders of a 2/4 coupled locomotive were located between the bogie axles for the first time on the European continent.
Names and numbering
In the Suisse Occidentale (SO) and the Suisse-Occidentale-Simplon (SOS), the locomotives were numbered 51 to 62 from 1872 onwards. The Jura-Simplon Railway (JS) gave them the numbers 251-262. Ten of the locomotives were decommissioned from the Jura-Simplon-Bahn, only No. 3 "Berne" and No. 4 "Romont" came to the SBB in 1903 with the new numbers 6398 and 6399 .
| designation | LFB no. | Surname | SO no. from 1865 |
SO / SOS no. from 1871 |
JS no. from 1890 |
SBB no. from 1903 |
Manufacturer | Construction year | discarded |
|---|---|---|---|---|---|---|---|---|---|
| from 1873: II from 1887: B2 from 1902: Ec 2/4 |
1 | Lausanne | 1 | 51 | 251 | - | Esslingen | 1862 | 1902 |
| 2 | Friborg | 2 | 52 | 252 | - | 1900 | |||
| 3 | Berne | 3 | 53 | 253 | 6398 | 1904 | |||
| 4th | Romont | 4th | 54 | 254 | 6399 | 1905 | |||
| 5 | Oron | 5 | 55 | 255 | - | 1895 | |||
| 6th | Cop | 6th | 56 | 256 | - | 1900 | |||
| 7th | Le Chamois | 7th | 57 | 257 | - | 1898 | |||
| 8th | Presévérance | 8th | 58 | 258 | - | 1895 | |||
| 9 | Singine | 9 | 59 | 259 | - | 1899 | |||
| 10 | Sarine | 10 | 60 | 260 | - | 1901 | |||
| 11 | Glâne | 11 | 61 | 261 | - | 1901 | |||
| 12 | Gruyères | 12 | 62 | 262 | - | 1897 |
swell
- Alfred Moser: The steam operation of the Swiss railways 1847-1966 . Birkhäuser Verlag, Basel and Stuttgart 1967