Over the past year I have been stocking up on Atlas Code 83 flex track. Most is from the two model train shops in Houston, I also bought some at a train show last year. Anyway, I was going through the inventory tonight and discovered that I have two different types! Both of them have "Atlas" "Made in China" "Superflex 83" and "Patent No. 4260104" on the bottom. On one type, the ties are slightly bigger, and the plastic connections between the ties are alot bigger than on the other type. As far as I can tell, they are both nickel-silver track, and they were sold as nickel-silver track. The rails look exactly the same in size and color. Is there any possibility that the bigger tie stuff is old brass track? Has anyone else seen this? The pic isn't that great, but notice the ties on the right are a little bigger, plus the plastic connections between ties are bigger.