There were a couple designs at Design Weekend including MIT's design where they use passive magnetic system instead of the active magnetic systems (Maglev) foun

There were a couple designs at Design Weekend including MIT's design where they use passive magnetic system instead of the active magnetic systems (Maglev) found on most high speed trains. By inducing Eddie-currents, they don't have to rely on embedded coils, just permanent magnets. Supposedly the teams using the passive magnetic system say the costs are low enough currently since you save power (no high power usage) and don't need to lay out specialized coils on the track. There are couple difference designs that will be tested at Design Weekend, including the air bearings proposed in the alpha paper along with magnets and wheels.