We've all been there. Forced to take the subway with a piece of impractical luggage -- an obnoxiously large suitcase, a desk bought off Cragislist or a giant bunch of balloons. For one man it just ...

The cart conveyor systems, by comparison, speed shoppers and their carts between floors along parallel tracks. Resembling side-by-side escalators, the escalator and cart conveyor combination also ...