Regarding the plastic wheels on this particular model:
Isn't that an Atlas model that has plastic wheels unlike ANY other N scale model they have? If I remember correctly, they stated on their forum that the wheels where produced by another company than the one they usually use.
The tread is broader, and the rim looks clumsy.
Apart from that it is a really nice model. I have it, and the plastic wheels can be replaced easily.
Javier