BMB CFm 2/4
| BMB CFm 2/4 | |
|---|---|
 CFm 2/4 No. 1
|
|
| Numbering: | 1-2 |
| Number: | 2 |
| Manufacturer: | SLM , SIG |
| Year of construction (s): | 1913 |
| Retirement: | 1923 |
| Axis formula : | B'2 ' |
| Type : | Liechty |
| Gauge : | 1000 mm ( meter gauge ) |
| Length over coupling: | No. 1: 11,740 mm No. 2: 10,530 mm |
| Bogie axle base: |
Motor bogie: 1700 mm |
| Total wheelbase: | No. 1: 7,400 mm No. 2: 6,500 mm |
| Empty mass: | No. 1: 13.3 t No. 2: 13 t |
| Payload: | No. 1: 2.3 t No. 2: 2.7 t |
| Service mass: | No. 1: 17.7 t No. 2: 17.3 t |
| Top speed: | 25 km / h |
| Indexed performance : | 175 hp |
| Coupling wheel diameter: | 740 mm |
| Control type : | Heusinger |
| Number of cylinders: | 2 |
| Cylinder diameter: | 220 mm |
| Piston stroke: | 300 mm |
| Boiler : | standing corrugated tube boiler |
| Boiler overpressure: | 12 atü |
| Grate area: | 0.45 m² |
| Superheater area : | 4.5 m² |
| Evaporation heating surface: | 17 m² |
| Fuel supply: | coal |
| Drive: | Lying two-cylinder steam engine as Klien-Lindner-axis trained Blindwelle |
| Transmission ratio: | 1: 1.36 |
| Seats: | No. 1: 32 No. 2: 24 |
| Classes : | 3rd grade |
The CFm 2/4 of the Biel-Meinisberg-Bahn (BMB) were two Liechty type steam railcars that were in service from 1913 to 1923. The two of SLM and SIG -built railcars had the same mechanical equipment, but different length box .
history
The BMB was a suburban railway from Biel that used the tracks of the Biel city tram to get to Biel station . Accordingly, vehicles were needed that could both negotiate the narrow curves of the tram and drive the non-electrified route from Biel-Mett to Orpund . At the same time, the vehicles should be as inexpensive as possible in order to meet the rail company's precarious financial situation.
Hermann Liechty was a control engineer at the Federal Office of Transport . He proposed a four-axle vehicle that was equipped with a motor bogie with radially adjustable axles. The two railcars delivered in 1913 had bodies of different lengths - the CFm 2/4 1 had 32 passengers, the CFm 2/4 2 had 24 passengers. The smaller railcar was mainly used in freight transport. The vehicles were nicknamed grassworms by the population because of their green color . After the cessation of running in 1923, the railcars were broken off in 1924. The railway did not start operating again until 1926, with railcars of the Biel city tram being used.
CFm 2/4 No. 1 with freight train
Only known picture of the CFm 2/4 No. 2
technology
The railcars consisted of a car body with two two-axle bogies, one of which was provided with a drive. The driver's cab with the steam boiler was located above the motor bogie. The standing corrugated tube boiler was equipped with a superheater . The two safety valves were also housed in the smoke chamber at the top .
It was driven by a two-cylinder steam engine located under the floor of the car, which drove a countershaft . This in turn drove a hollow shaft via a gearbox , which transferred the internal force via a centrally arranged cardanic ball joint to the axle of a jackshaft, which drove the two wheel sets via coupling rods . The arrangement of the hollow shaft with the jackshaft inside corresponded to that of a Klien-Lindner hollow axle , only this was not an axle of a wheel set, but was attached to the box, where it ensured the freedom of movement of the bogie in relation to the car body.
Next to the driver's cab was the luggage compartment and four compartments for the large and three compartments for the small railcar.
The railcars had the SLM serial numbers 2319 and 2320.
Web links
Individual evidence
- ^ A b Walter Hefti: Steam trams . Springer Basel AG, Basel 1984, ISBN 3-7643-1536-9 , p. 60-61 .
- ↑ Reference to Hornerblatt 2003. Association for Home Care Büren, accessed on January 24, 2020 .
- ↑ Jürg Ehrbar: Biel-Meinisberg-Bahn BMB. In: discontinued railways in Switzerland. Retrieved January 23, 2020 .
- ↑ SLM locomotives 1871-1984 ISBN 3-907976-01-0 , page 69