I Love Bouncing!
No, trampolines are not involved...
While I was looking around the web, trying to confirm my memories of visiting The Golden Spike Historic Site, I came upon an interesting and well-run website that would be of great interest to rail/train buffs. Or 19th century history buffs. Or Old West buffs. Or Utah history buffs. Oh, all sorts of people would like this site!
The Central Pacific Railroad Photographic History Museum has a slew of information about not just the Wedding of the Rails (as the Transcontinental Railroad joining ceremony is often called) but lots of resources about train and US commerce history. I was especially impressed with the links offered to school kids who may be doing reports about the subject. Check it out!