Lumiere have developed a system to view train models, (for example) and have the ability to walk around and explore in real-time, much like a computer game.
We can control the seat layouts, the moquette textures, handle design, lighting etc, all from a click of a button. There is no need for rendering, you can see instant results. These can then be rendered out to a QuickTime, or viewed in real-time on a PC, Mac or tablet.