Jacobs bogie
Jacobs bogies (named after Wilhelm Jakobs[1],,[2] 1858–1942, a German mechanical railway engineer) are a type of rail vehicle bogie commonly found on articulated railcars and tramway vehicles.
Instead of being underneath a piece of rolling stock, Jacobs bogies are placed between two carriages. The weight of each carriage is spread across the Jacobs bogie.[1] This arrangement provides the smooth ride of bogie carriages without the additional weight and drag.
Talgo trains use modified Jacobs bogies, that only use two wheels, and the wheels are allowed to spin independently of each other, eliminating hunting oscillation.
Background
The first fast train using this type of bogie was the German
Vehicles featuring Jacobs bogies include the
In Australia, Jacobs bogies were first used in 1984–85 on
Not a Jacobs bogie
A number of
Locomotives
Some triple-bogied two-section electric locomotives such as the
Tram (streetcar)
The Jacobs bogie can be found in trams (streetcars) such as the
US interurban trains
On this crossover between the tram (streetcar) and the
Advantages
- Safety, because the trains are less prone to collapse like an accordion after derailing. A Eurostar train has been recorded as having derailed at a speed close to 300 km/h with no resultant loss of life or severe injuries among its passengers.[4]
- Lower weight and simpler and cheaper construction because bogies are heavy, expensive, and complex structures.
- Less rail squeal and other wheel-to-rail noise because of fewer bogies.
Disadvantages
- The cars of the vehicle/unit are semi-permanently coupled and can only be separated in the workshop. However, some flexibility may be achieved by coupling two or three units together into one train.
- Fewer bogies and fewer wheelsets mean greater axle loads – if everything else is equal.
Gallery
- Examples of Jacobs bogies
-
Jacobs bogie on a TER regional train in Alsace, France -
Jakobs bogie on thePesa SA -
Disassembled joint of a Stadler FLIRT with the bogie removed -
Jacobs bogie on an EER Class 300 train. -
Jacobs bogie on a DBAG Class 425 train. -
Schema of a Jacobs bogie, shown on the upper half -
A closeup of a jacobs bogie on the preserved Nebraska Zephyr -
Jakobs bogie on the Doppelstock-Stromlinien-Wendezug of the Lübeck-Büchen Railway Company in 1936
References
- ^ a b "Bogie designs" (PDF). SKF. 2012.
- ^ "Bogies". The Railway Technical Website.
- ^ Leutenegger Engineering & Consulting Forged Aluminium Parts for Rolling Stock Structures
- ^ "Eurostar train derails in France". BBC News. 2000-06-05. Retrieved 2014-03-26.