I'm considering adding a Sunshine X-3 tank car to my roster, and have a few questions. There are a few different styles/sizes offered, what was the approximate percentages of each in the late 30's? I know that this probably shouldn't be included in the criteria, but which would be appear (to the uneducated) least like the Proto or Intermountain tank cars? Perhaps I should ask "Is there any that could be mistaken for a more common plastic/RTR tank car?"