It has a much larger area exposed to the elements (the magnetic rails). Basically this is building a mini maglev train and attaching a wiper to it, while the tr

It has a much larger area exposed to the elements (the magnetic rails). Basically this is building a mini maglev train and attaching a wiper to it, while the traditional setup is just a motor. Up to you to decide if a train is more complicated/reliable/efficient than a motor.