Great Tom, glad it went smoothly, sadly they don't always go that way. Sounds like it was a hit! 
We had our modular display at the Phila Art Museum years ago in a rotunda who's name escapes me, it's the one with the pool in the middle. We had our display all around it. The kids kept coming up and touching and grabbing the trains. A couple of kids actually took trains completely off the tracks! We had to continually patrol the outside looking for trouble, sadly we weren't always quick enough.
