The basement layout is under "permanent" construction and rarely has visitors. My wife and daughter don't even look at it. But last year my son and I put together a holiday layout upstairs that does get some interest from family and friends.
Typically run the Ski Train, Sante Fe Flyer, and N&W "J" Passenger train. If there are accidents or rough handling, it's not a big deal. This year we picked up a Polar Express set from a forum member and will add that to the rotation.
We leave the bigger engines and smoke units for the basement.