This three level auto rack was originally found on LGauge .com as seen here: lgauge.com/trains/freightcars/autork/autork01.jpg I redesigned that model and added tiny automobiles to fit into the racks. There is but a single plate worth of clearance between the automobiles and the rack above.
Their are going to be two of these auto rack freight cars built in real life at some point in the no-so-distant future.
The automobiles are attached using 2 x 3 plates, put they are removable... if you take the roof of the freight car off first!
These tiny cars are supposed to be made at the Factory I uploaded a while ago.