Okay as a avid petrol head and engineer i have finally broke and have to ask

bendy buses how do they work ?

For those that have not seem them they are a bus with a flexable bit in the middle meaning they can be longer and more maneuverable. Now here is my question the engine appears to be in the back bit of the bus as in after the flexable bit and the steering is in the front half which has two axles but the back half with the engine in it has only one axle. now i would of thought that this would of caused all sort of strange behavour with the "trailer" part of the bus pushing.

Or is there some strange method of transmitting power to the front bit from the trailer.