Does 'prototpye' mean authenticity? If so, then I do care about that, at least I would like to be aware of it. I didn't know that freight cars were exchanged (I don't know much about trains...) but that is great to learn, that means we could have a B&O car on a NYC train 
What is the best way to learn about the time period for trains, are there books/magazines that you would reccommed to look at to get a feel for the era?

What is the best way to learn about the time period for trains, are there books/magazines that you would reccommed to look at to get a feel for the era?