Removing acrylic caulking from cork roadbed

[Gary S]

You're right, Kevin. I just googled it and it is made from copper, nickel, and zinc. Brass is copper and zinc, so the nickel silver is brass with the nickel added. Don't know why I was thinking it was stainless steel. It should have dawned on me that the track is much softer than stainless steel.

So, the expansion rate would be somewhat greater than my previous calculation.