[Graham]

It's the inverted base it is sitting on. It looks about OK to my uncalibrated eyes...probably.

Track clearance is related to chassis and motor, as this constitutes a tremendous performance advantage, especially the motor, as “ magnetic traction” is greatly enhanced at track heights above the metal contact rails in the 1-2mm range the former being probably around 10X times stronger than the latter for any given motor. And our proxies tend to be using a combination of plastic and wood (non magnetic) tracks.

Outer plastic body or protruding body screws under the 1.5mm clearance are more likely to be a performance disadvantage as on the plastic tracks there is more chance they might catch on any raised sections of uneven track joints …..or in my case the curved track underpass section on the Carrera track.