On Saturday 7/18/17 I was coming in to Chicago on the eastbound 6 California Zephyr. At Naperville we met the westbound California Zephyr and to my pleasant surprise the last 2 cars on the train were an ex Sante Fe Big Dome lounge car and behind it was another passenger car in Illinois Central (Chocolate over Orange) colors. I am assuming that the last car was an sleeper but whatever it was does anyone know about those 2 private cars and/or where they were heading to? There was at least one person in the ex Sante Fe Big Dome Lounge Car. It was stainless steel however it was marked in black lettering on the side for some company that I don't recall.