As I am going through my rolling stock and kits to be built I am trying to organize things. One thing I discovered is that I have acquired a good bit of rolling stock from Midwestern, and western railroads such as Northern Pacific, Great Northern, and CNW. My model railroad is located in the mid-Atlantic. My question is what is a good percentage of off road rolling stock to have? Also how likely would a car from a western road such as GN, NP, or SP appear in the mid-Atlantic? From growing up near the B&O I can remember certain railroads from outside the mid-Atlantic where common. I can remember seeing quite a bit of Santa Fe and Union Pacific cars rolling by the house.