This isn't Z scale but I thought it was pretty interesting. I came across this on a tooth pick website of all places. It looks like it's smaller than 1/900th scale (which is what I think tiny trains are). Pretty impressive I think for someone to carve this on a tooth pick. The caption on the website reads "This was the 9 car freight train that was carved for the "Ripley's Believe It Or Not" museum. If you notice, you can see between the wheels!"
Sorry guys, this is not Z, but N scale and Lionel tinplate. An N scale model of a Lionel tinplate garage in a garage in Fort Worth that actually housed an HO layout in the 1970s. I thought it would show nerve to enter a contest with a model of a prototype that would be on the layout tour and seen by everyone at the convention...