Maglev

“	That stator control unit can reverse the polarity long enough to disengage maglev and that could...	”
	— Maglev architects warning about stator control units

Maglev (short for magnetic levitation) is a unique classification of trains whose rolling stock utilizes electromagnets that levitate the train as opposed to having wheels that roll on rails. This eliminates rolling resistance, which enables the trains to reach speeds of up to 603 km/h, a figure that set a new speed record for trains. This was accomplished by an L0 Series train in Japan. One of the more familiar maglev systems is in Shanghai, China, where trains shuttle passengers from the city centre to the airport.

The concept of maglev isn't really a new concept; even Robert H. Goddard, the guy who made the first liquid-powered rocket, conceived of magnetically propelled frictionless trains.