CoasterDynamix at Chicago's Hancock Building

Those folks visiting Chicago during the holiday season may want to visit the Holiday Train exhibit at the John Hancock Building on North Michigan Avenue.

This year, it includes a CoasterDynamix model, which was fun to see and now requires me to make a detour each time I pass through the concourse level during my work day.

(Sadly, whoever put the ride together actually created two short coasters instead of one long one, and the train only runs on one -- the lift hill and a loop, and back again. But it's still fun to see.)