I'd previously bought one of these Spacerail toys a few years back. Pretty good fun; great for the kids, and us adults who like the Gravitram!
Gravitram, you say?? http://www.gravitram.com/index_and_chronology_of_gravitra.ht…
Because they're modular, you can customise and connect with other sets. Buy a couple and chain them together in various configurations.
good find ops, been looking for ages….but never bought one.