Thanks, Mal. So, in Melbourne’s case, all its articulated trams have Jacobs bogies? And in all of them only the end bogies (i.e. under the cabs) are powered?

NSW will be different, I suppose!

David

> On 21 Jul 2021, at 4:24 pm, Mal Rowe mal.rowe@...> wrote:

>

> On 21/07/2021 16:16, TP wrote:

>> Mal would be able to answer that one giving his favourite tram as an example! It's a bogie shared between two cars. A. example is the centre bogie on the B class tram. The Skoda bogie is a little different, having two kingpins, each one attached to each car in order that the tram can negotiate tight curves (15-18 metres) and still remain within its kinematic envelope. A normal Jacobs bogie has one kingpin attached to the coupling point between two cars.

>

> Here's a pic of a Jacobs truck without a B sitting on it.

>

> The two ends of the tram rotate around the rings visible in the centre - supported by forks from each car-body.

>

> Jacobs trucks are usually un-powered because the extra gear for the articulation takes up quite a lot of space.

>

> Mal Rowe - on the spot at the right time for the pic

>

>

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> <Jacobs-truck_April2019.JPG>