ASt HG 2/4
| ASt HG 2/4 | |
|---|---|
 |
|
| Numbering: | 5-8 |
| Manufacturer: | SLM |
| Year of construction (s): | 1904-1909 |
| Retirement: | 1931-1934 |
| Axis formula : | 1'B1'z |
| Length over coupling: | 8450 mm |
| Service mass: | 5-6: 33.7 t 7-8: 35.2 t |
| Friction mass: | 5-6: 22.9 t 7-8: 24.0 t |
| Indexed performance : | approx. 350 hp |
| Driving wheel diameter: | 815 mm |
| Impeller diameter: | 576 mm |
| Gear system : | Riggenbach-Klose |
| Size gears: | 860 mm |
| Cylinder diameter: | 370 mm |
| Piston stroke: | 400 mm |
| Boiler overpressure: | 14 atm |
| Grate area: | 1.26 m² |
| Evaporation heating surface: | 70.1 m² |
The HG 2/4 5 to 8 were meter-gauge steam locomotives for combined adhesion and gear drive of the Appenzeller tram (ASt). They were delivered in 1904 and 1909 by the Swiss Locomotive and Machine Works (SLM) and were the first machines with a drive based on the Winterthur system .
history
In 1889, the Appenzell tram started operating on the St. Gallen – Gais route. For the continuation from Gais to Appenzell , which opened in 1904, two additional steam locomotives had to be procured. The HG 2/3 1–4 locomotives delivered in 1889 and 1890 with Klose steering gear were complicated and only partially proved themselves. They were heavily used, which was reflected in the costly maintenance and the many disruptions. The construction of the new locomotives was as simple as possible, with sufficient curve maneuverability and a trailer load of 50 tons.
construction
In narrow-gauge locomotives with mixed adhesion and gear drive, it was not easy to accommodate the engines . The four wet steam locomotives designed and built by SLM in Winterthur were the first locomotives with a drive based on the Winterthur system. The four cylinders of the adhesion and gear drive were arranged one above the other in a common cast block . The two external high-pressure cylinders drove the two coupled adhesion drive axles. The low-pressure cylinders, which driven the gearwheel via a shaft, were located above this. The Winterthur system enables good accessibility and thus easier maintenance of the engine .
In adhesion mode, the lower cylinders worked alone like an ordinary twin locomotive. On the rack and pinion sections, the locomotive worked in concert with the steam flowing after the lower adhesion high pressure cylinder into the upper gear low pressure cylinder. Due to the gear ratio of 1: 2.21 of the back gear , the gear drive worked twice as fast as the adhesion drive and worked in the opposite direction. The resulting higher steam consumption compensated for the expansion of the steam, which is why both high-pressure and low-pressure cylinders could be equipped with the same diameter. The composite effect made better use of the steam and there was a good balance between the gear drive and the adhesion drive, which reduced the spin of the adhesion drive. When starting up on a rack section, the boiler pressure could be directed directly to the low-pressure cylinder.
The machines with a front and rear running axle had a top speed of 30 km / h on adhesion sections, 24 km / h on the uphill and 18 km / h on the downhill section of rack sections. The locomotives were equipped with a counter-pressure brake , a Westinghouse brake , a handbrake , a band brake acting on the drive gear, and a gear emergency brake attached to the front coupling axle. The locomotives were equipped with a Hasler speedometer and a device for steam heating . The machines delivered in 1904 cost 55,000 francs each, the locomotives of the second delivery 61,600 francs. They were therefore significantly cheaper than their predecessors HG 2/3.
Locomotive No. 6 was equipped with a Schmidt steam superheater in 1918 .
| number | Surname | Construction year | Discarded |
|---|---|---|---|
| 5 | Appenzell | 1904 | 1932 |
| 6th | Säntis | 1931 | |
| 7th | Gaboris | 1909 | 1931 |
| 8th | Fröhlichsegg | 1934 |
literature
- The extension of the Appenzell tram from Gais to Appenzell In: Schweizerische Bauzeitung . Volume 45 (1905), issue 24 (archived in E-Periodica.seals.ch of the ETH Library , PDF; 4.0 MB).
- Josef Hardegger: 100 years of the Gaiserbahn . A chapter of eventful railway history in Appenzellerland. Schläpfer + Co., Herisau 1989, ISBN 3-85882-063-6 .
- Alfred Moser: The steam operation of the Swiss railways 1847-1966 . 4th updated edition, Birkhäuser, Stuttgart 1967.
Remarks
| Meter gauge |
|
||||||||||||||
| Track width 1200 mm |
|
||||||||||||||
| Standard gauge (1435 mm) |