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Instead of being underneath a piece of rolling stock, Jacobs bogies are placed between two carbody sections. The weight of each car is spread on one half of the Jacobs bogie.
The first fast train using this type of bogie was the German Fliegender Hamburger in 1932. In the United States, such configurations have been used throughout the twentieth century with some success on early streamlined passenger trainsets, such as the Pioneer Zephyr in 1934, various Southern Pacific Daylight articulated cars, and Union Pacific Railroad's M-10000. Dallas Area Rapid Transit rail trains originally used a center bogie in a two unit car but have been modified to add a lower center section for handicapped level entry making a 3 unit car with two Jacobs bogies.
Vehicles featuring Jacobs bogies include the Alstom-made TGV and Eurostar trains, the Bombardier Talent series of multiple units, the LINT41, the Class 423 S-Bahn vehicles, the Canadian CN Turbo-Trains, several FLIRT trains, IC3 by Adtranz and the Škoda ForCity tram.
Intermodal freight trains, such as Pacer Stacktrains, use container well cars in groups of three to five cars, connected as a unit with a connector assembly on top of a standard North American trucks between the individual well cars.
Some triple-bogied two-section electric locomotives such as the NZR EW class have an articulated body supported on the centre bogie. Other types of Bo-Bo-Bo locomotives instead use a body shell that has enough allowance for sideplay in the central bogie.
On this crossover between the tram (streetcar) and the high-speed train, Jacobs bogies occurred on the latest equipment of any significance, the two Electroliner trains (1941–76). They were suited for streets with tight curves, the Chicago El and running through the countryside at approximately 140 km/h (87 mph). They served the Chicago–Milwaukee line and later the Philadelphia area.
- Safety, because the trains are less prone to collapse like an accordion after derailing. A TGV 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
- 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.
- The vehicles are semi-permanently coupled and can only be separated in the workshop. However, some flexibility may be achieved by coupling two or three trains together.
- Fewer bogies and fewer wheels mean greater axle loads – if everything else is equal.
- As cars are only supported at their ends, the middle of each carriage will describe a wider path on curves than independently-supported cars, thus requiring a wider loading gauge.
|Wikimedia Commons has media related to Jacobs bogies.|
- Leutenegger Engineering & Consulting Forged Aluminium Parts for Rolling Stock Structures
- "Eurostar train derails in France". BBC News. 2000-06-05. Retrieved 2014-03-26.