A method for reducing energy consumption, and amounts of cleaning liquids and rinse liquids used. When not in use, the retractable platform would be retracted into a position of concealment beneath the door of the train car. A roll-out shelf mounts merchandise supporting modules with pushers to move merchandise toward the front of the structure where ejection mechanisms in each of the modules are able to direct selected items to the front of the structure where they can be accessed by consumers. The light radiated by a light source so as to be incident to the optical device is converged by the optical lens.