The oberweissbach mountain railway: how ist operates

The mountain railway consists of two sections:

  1. The funicular line between Obstfelderschmiede and Lichtenhain
  2. The upland line between Lichtenhain and Cursdorf

When the contract to build a rail line was announced, the connection had to run between Obstfelderschmiede and Cursdorf, i.e. the funicular was an integral part of the route from the very beginning. Today, the line bears the number 6691 in Deutsche Bahn AG's system.

The funicular section uses two different vehicles, a passenger wagon and a freight transporter. The latter can carry rolling stock with a standard gauge and total mass of 27 tonnes.

Its original purpose was to carry freight between the hills around Oberweissbach and Germany's nationwide rail network.

Today, the freight wagon on the transporter's platform has mostly been replaced by what started out as an auxiliary railcar – an open-top carriage that we call our "convertible".

The single-track line uses an Abt-style switch halfway along the route to let the vehicles pass each other. Another Abt switch at the valley station splits the line into two tracks, one leading to the platform for the passenger carriage, the other to the loading ramp for the freight transporter.

There is a turntable at each terminus, giving the line a connection to the larger rail network with its standard-gauge tracks.

Combined, these features have created a funicular railway like no other in the world. Still fully operational today, it is a living monument to technological ingenuity. 

 

Oberweissbach mountain railway: technical data

Planning and overseeing the overall system: Dr. Wolfgang Bäseler

Planning and construction of funicular components: Heckel, Saarbrücken, Germany

Original technical data:

Type:

 

Single-line funicular railway with 2 vehicles and Abt switches

Length:

 

1,387.8 m

Track gauge:

 

1,800 mm (standard gauge: 1,435 mm)

Vertical distance:

 

323 m

Altitude of valley station:

 

340.8 m above sea level

Altitude of summit station:

 

663.8 m above sea level

Gradient:

 

23.92 ... 25%

Speed:

 

1.6 m/s  (5.76 km/h)

Journey time:

 

18 min

Cable diameter: 

 

40 mm (nominal diameter)

Diameter of drive pulleys:

 

4,000 mm each (of 2)

Wrap angle at drive pulleys

 

270° (x2) = 540° total wrap angle

 

Rotational speed of drive pulleys at 1.6 m/s: 

 

7.64 rpm

 Drive system: 2 asynchronous three-speed motors and two drivetrains

  • 110 kW, 3 x 400 V each
  • Max. 935 rpm

Gearing:

  • 2 units 4-stage spur gear and two drivetrains
  • Total gear ratio i = 122.34

Cable:

  • Diameter = 40 mm
  • 6 strands with 25 wires each (incl. 6 cored wires)
  • Compacted with polypropylene inserts
  • Right-hand lang lay
  • 6.28 kg/m

Machine house – the heart of the funicular line

Located in the machine house, the funicular's drive system consists of the following main components:

  • Two asynchronous three-speed motors producing 110 kW each and which move the sheave wheels via the drivetrain. An electronic management unit handles synchronisation.
  • The two sheave wheels are mounted at a right angle to the direction of travel, so two deflecting pulleys change the orientation. The sheave wheels and deflecting pulleys are all 4 metres in diameter. Large loads (freight) can only be moved thanks to this space-saving configuration with the maximum cable wrap angle, thereby producing a substantial contact surface between the cable, the surface of the cable groove and the sheave wheel.

Operating brake and security brake, both of which function as a spring-loading brake. The brakes open hydraulically.

Abt switches – the funicular's special switch system

Abt switches have no moving parts. The passenger carriage has double-flanged wheels on the left-hand side, and it is guided by the left-hand rail. Its roller wheels on the right can simply pass over the cable gap in switch. On the freight transporter, the wheel positions are reversed. It is guided by the right-hand rail, while its roller wheels are located on the left.

The switch type is named after its inventor,

Carl Roman Abt (born 16 July 1850 in Bünzen, died 1 Mai 1933 in Lucerne) was a Swiss engineer, inventor and entrepreneur. He came up with several ground-breaking solutions, such as the Abt system that applies cog and adhesion power for rack railways, and the "self-steering" switch used at Oberweissbach. In addition, he also oversaw the construction of 72 mountain railways around the globe, with Visp-Zermatt, Gornergrat, Furka and Monte Generoso being just some of his projects.

(Photo and information sourced from Wikipedia)