"Jacobs bogies (named after Wilhelm Jakobs,, 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. This arrangement provides the smooth ride of bogie carriages without the additional weight and drag.
Some 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." - (en.wikipedia.org 07.11.2021)
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