Some of the bendy buses I have observed here in Canda have the motor in the "front half"

Same here in Sweden - looks like the engine is mounted "lying down" so not to steal as much height...

But looking at Volvos site there appears to be at least one with only engine at the rear. It also looks to be no, nor room for a, shaft going the forward part. Interior floor is only 30-something centimeters above the ground, but only 23 centimeters when stopped and "courtsying" (sp?) to simplify for people getting on/off. Then the link/pivot is probably about 10-15cm thick...

Hmmm, could they be using some sort of locking/damping mechanism in the pivot to stabilize things?

/Michael