Scattergun EM Whimsy, a coach you may call Annie (or Clarabelle, if you really want).

[AJC]

you could point out to the budding engineer that strictly, the four wheel one has one more wheel than necessary and the six wheeler is amply overfurnished. And refer him to his tricycle.

Possibly wise to avoid a discussion about flanges however...

Thinking about it, he deferred to the TV programmes (via YouTube) for the four wheels, and decreed that 'one in each corner' was correct which is logical, at least. He's come to terms with this now...

Adam

PS - Would @Lyndhurstman like a P4 Mansell carriage wheel? For some reason one of the four axles (two pairs) I bought came as a half and half...