The downtown Minneapolis Target has this as well. We also have a two-level Menards (home improvement store chain) in the suburbs, with a moving ramp to take shoppers and carts up to the 2nd level. The wheels have a round plate that locks into the grooves of the moving ramp.

Although I've seen multi-level stores with ramps for carts in several cities in China as well, although usually they just have bumps on the moving ramp so the carts don't get so out of control.