The Atlas kit seems very accurate, my only complaint is that the parts don't come apart easily. I would have loved to get the windows out of mine so I could paint the window frames silver. But, since they wouldn't budge, I have yellow window frames on mine. I didn't want to risk getting silver paint all over the clear plastic windows. This kit does come with metal wheels which are a plus. You will need to paint the platform ends, smoke stack, and underside blue to be correct. This kit does come with individual grab irons which are a very nice touch. The markings are good too. No real complaints at all with this kit. I only ever made this one below, but Atlas has released some in C&O blue and a few of the Safety schemes.
Below is my Atlas C&O Cabin next to the real
The Dean Heacock pic on the right is actually 903296 the caboose
the one in the Atlas model. Notice the pictures are of
The windows on the two sides were in different places.