[DPJ]

Let me ask, what is powering your track? And what controllers are you using to run the cars. These 2 items make the most difference in getting a car to go on any track. I guarantee if you sent me this car in question, and I put it on my track to run, it will go like mad! Yeah, unless of course a gear is chewed or an axle is bent - but that's a clear defect.
My Carrera track is custom wired with a 10A adjustable voltage power supply and I use Slot.it controllers that are amazing. I run all my cars at 12v (1/24 and 1/32) - except the couple 1/24 Carrera cars that require 18v.