It is the passage of the cart with its Halbach arrays that induces current in the coils which then produce the levitating force. Another advantage of Inductrack is that it can use powerplants already in use. You would certainly do those electrically. But if you were going cross country on a high-speed system, maybe the initial phases wouldn't be all electric. Maybe that would be magnetic levitation with the Inductrack principle, using a gas turbine to drive it.
Magnetic levitation occurs when the vehicle reaches transition speed.
At this point, the two Halbach arrays on the bottom of the car provide levitation and one on each side create lateral stability. The scale model needs to achieve higher takeoff speeds than a full-size train. The demonstration confirms what the calculations have already predicted. Before transition speed is reached, the electromagnetic currents are out of phase, resulting in considerable drag on the vehicle. This drag becomes apparent when the car is pushed by hand.