crickets
I assume this is contemporary stuff that you are looking for.
Aside from the Conrail stuff, there really isn't much out there (it's been 40 years since NS was formed!). There is MOW stuff as posted above, but the vast majority of that is in post merger markings.
Personally, I am really swamped with my job (have been all year), but if I get a chance I'll take a look around.
Mark