Trying to be more prototypical on my layout (though still willing to employ Rule 1 if I just can't help myself). Thanks all!
http://www.borhs.org/ http://cohs.org/ The respective railroad's historical societies should be a good place to start. I know the B&O society has a nice magazine.
Go to the C&O historical society website and on the left side of the screen you will see "research request". They are very good about getting back to you with answers. WWW.COHS.ORG