they've been twenty years in development unlike conventional models they function without weights or cables. the elevator cab in sits on a kind of slide that travels along to guide rails. the rails essentially do the same thing a cable does in conventional lifts the power generates a mobile magnetic field that propels the cabin in the planned direction. the cabin can also travel sideways. what's called the exchanger sets it on the horizontal track. i'm not allowed to take a ride the engineers are still waiting for safety approval that should happen in about two years time. if there's a sudden power outage the brakes immediately grab the guide rails cooking the cabin in place. the system would open up