I tracked down the whole Ives set from different sellers. The 1707 arrived today. I don't think they are going to look as nice as Greg's set. Mine will be in a little worse condition. They are long compared to the 2800 series cars I have and sit lower on the track. However, my Lionel 2815 tank car can couple to them, and the size is OK. So, I don't think I will pursue an AF 3210 right now.
I also picked up a Lionel 1722 before I got the 1712. It's orange instead of red. The seller thought the litho had faded, but it is just a different color. He probably didn't realize Lionel made the 1722 in orange. It has copper journals, so I believe it is the (A) variation in the Greenberg vol II guide, which is the first Lionel version from the orange Ives caboose.
I also ended up with several other cars in various conditions, because I had to buy the Ives in a Lot with other cars. After I clean them up, I may post the extras on the For Sale board.
I will post pictures and videos once I receive them all and get them cleaned up and running.
George