WAB bra 4/8
| Bra 4/8 | |
|---|---|
 WAB Bhe 4/8 141 in Grindelwald Grund
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| Numbering: | 141-150 |
| Number: | 10 |
| Manufacturer: | Stadler Rail |
| Year of construction (s): | 2004, 2014–2015 |
| Axis formula : | 2'z + 2'z 2'z + 2'z |
| Gauge : | 800 mm |
| Length over buffers: | 41,830 mm |
| Height: | 3,420 mm |
| Width: | 2,300 mm |
| Bogie axle base: | 2.20 m |
| Total wheelbase: | 35.84 m |
| Service mass: | 47.5 t (141–144) 49.3 t (145–150) |
| Top speed: | 28 km / h |
| Hourly output : | 880 kW |
| Hourly traction: | 150 kN |
| Wheel diameter: | 728 mm (adhesion) 637 mm (gear) |
| Gear system : | Riggenbach |
| Power system : | 1500 volts DC |
| Power transmission: | Overhead line |
| Number of traction motors: | 4th |
| Seats: | 152 |
| Classes : | 1 |
The WAB Bhe 4/8 is a low-floor panoramic articulated railcar with gear drive operated by the Swiss Wengernalp Railway (WAB). In 2004, WAB acquired the four three-part Bhe 4/8 141–144 within its WAB 2005 concept , followed ten years later by six more with the numbers 145–150. Instead of the type designation in front of the number, the trains have the designation "Pano".
history
The WAB 2005 project (continued operation of the rack railway) of the Wengernalp Railway provided for, among other things, the procurement of new, more economical multiple units. The Wengernalpbahn ordered four three-part low-floor multiple units from Stadler Rail AG . The new multiple units were delivered in 2004. The new multiple units now enabled more efficient operations with additional space and more comfort for passengers, thanks to the low-floor entrances, spacious multi-purpose platforms and a ventilation and cooling system. The railcars have a top speed of 28 km / h, which resulted in a homogeneous performance and speed spectrum. Since the Bhe 4/8 are faster than the old railcars of the Wengernalpbahn, it had become difficult to have the modern and old railcars run together on one section of the route. That is why the old BDhe 4/4 101–118 are only used together with the Bhe 4/8 and BDhe 4/8 when there is a high number of passengers.
Replica series
In order to further renew the vehicle fleet and thus also increase comfort and performance on the Lauterbrunnen side, six more multiple units were ordered. They were put into operation in 2014 and 2015. The first WAB Pano, which was ordered in the same year, has been running on the Lauterbrunnen-Kleine Scheidegg line since December 18, 2014.
technology
The Bhe 4/8 141–150 are rack and pinion railcars for 800 mm gauge with the Riggenbach rack and pinion system. The smallest passable arc radius is 60 m. The single-arm pantographs are located on the end car bodies above the bogies. The permissible speed is 28 km / h when driving uphill, 21.5 or 14 km / h when driving downhill. The Bhe 4/8 are designed in three parts.
Brakes
According to the implementing provisions of the Railway Ordinance, the vehicles are equipped with two independent mechanical brakes. The brake system 1 (regulating brake) acts as a band brake on the rapidly rotating motor shaft and can be regulated. The transmission of braking force therefore also runs via the transmission. Brake system 2 (fall-back level) is also designed as a band brake and acts directly on the axle shafts. Both mechanical brakes are designed as spring-loaded brakes. Compressed air is therefore required to release the brake.
An electrical resistance brake is available as an inertia brake for the descent. This can also be operated without an inverter with an emergency switchover. This is necessary because the mechanical brake alone would not allow a descent.
construction
The Bhe 4/8 have a total of 140 seats , 12 folding seats and 66 standing places . The trains have spacious multi-purpose platforms for bicycles, skis or the like. In addition, a ventilation and cooling system contributes to the comfort of the passengers. Both end cars have a low-floor entry on both sides with an entry height of 350 mm. The end cars are high-floor above the bogies. The middle car has large panoramic windows and is high-floor, has no entry doors and runs on two bogies. The end cars run on only one bogie each and are supported at the other end via a spherical joint on the middle car. The basic structure has been derived from the Stadler GTW . Comparable to the MGB BDSeh 4/8 (Zermatt Shuttle), also here with a four-axle middle section. In contrast to the MGB BDSeh 4/8, all of the bogies are driven, with each bogie having a drive axle and a running axle. This distribution of the drive power is necessary to guarantee safety against derailment and climbing of the gears at 250 ‰. For the same reason, the drive axes must always run downhill.
commitment
The “WAB 2005” planning was based on the assumption that the half-hourly service from Grindelwald to Kleine Scheidegg could be covered with three train compositions. These three trains are in times of heavy traffic; two trains with these Bhe 4/8 in double traction (Bhe 4/8 + Bhe 4/8), as well as a train with the somewhat older BDhe 4/8 in double traction and a low-floor control car (BDhe 4/8 + BDhe 4/8 + Bt ).
Today the Bhe 4/8 141–150 are in use on the entire route network. When there is a high number of passengers, mainly in summer and winter, the multiple units run in double traction . The railcars are used on both sides of the Kleine Scheidegg. When changing the line branch, the railcars at Kleine Scheidegg station must be turned over the Gleisdreieck because the braking equipment only allows the descent in one direction.
literature
- 100 years of the Jungfrau Railway . In: Eisenbahn Kurier Spezial . No. 104 . EK-Verlag GmbH, 2012, ISSN 0170-5288 .
- Beat Moser, Urs Jossi: Jungfrau Railway . In: Eisenbahn Journal special edition . No. 1 . Hermann Merker Verlag GmbH, Fürstenfeldbruck 2002, ISBN 3-89610-089-0 (96 pages).
- Theo Stolz: Locomotives in Switzerland . Minirex, Lucerne 2007, ISBN 3-907014-31-6 , p. 495 .