Our local Amtrak (The Pere Marquette) is usally a Cabbage, 3 or 4 superliners and a loco. It is very rare that we see the private varnish, and it seems like most of the time we do, it is either coming to or going from the shortline I work for. Private car storage is kind of a big thing for us. We had the ex-NYC Babbling Brook until recently, and the famous NAVY observation car has been known to park on one of our sidings before.
I used to love seeing the cross-country runs through Northern Indiana with all the baggage, mail and express cars outnumbering coaches and sleepers 3 to 1. I do get to see the 110 mph Porter, IN-Kalamazoo, MI runs on occasion, but they go so fast that you can't really see them unless you catch one at a station stop.