I've seen the various posts that give "Marketing Categories" for digits 3 & 4 of the new numbering system. But Lionel doesn't seem to be using the 87- (HO) or 48- (O & S) prefixes -- meaning marketing categories for the two groups overlap on the posted lists.
I've created the list below of my 'best guesses' for the new Lionel 7-digit marketing categories. I've also added a few of the pre-2018 6- 7- etc. numbers that seem to -- maybe -- have a specific meaning.
I've enclosed my list. If anyone has more or better info - on either the old or new numbering systems -- could you please share? I'd love to have a more complete idea of what info can be extracted from Lionel Catalog numbers...