Hi Ben
On the whole, the Atlas C-630 is a very good reproduction of the prototype. The biggest issue to me is the cab side window location. When Alco built the first Centuries, the side windows were centered along the cab side. Later when they lengthened the side at the front end, on late C-628s, C-430, C-630 and C-636 models, the window location remained where it was, thus the side windows now appeared offset to the rear. Nit picking maybe, but just not quite correct.
PM me and I will send you some roof photos of WNY&P C-630M #630.
Cheers
Steve