Yet, Mal, surely what you show in this photo is not a bogie with a king
pin.  It appears to be the Duewag version of the bogie, where the body
parts are supported on the rings, which being circular, keep everything
in order.  I would think it a bit of a stretch to say that the circular
arcs are "king pins"?

Regards

Dudley Horscroft

On 21/07/2021 4:24 pm, 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

>

>