By 2030, you could be crossing the Atlantic by train
Kyotani's TTS would use magnets not only to levitate the train, but also to propel it with a series of magnetic pulses from the side of the track. Each push needn't be very large since it's the accumulation of pushes over many miles that would achieve high velocities.
The first generation of TTS trains is expected to run at 2,300 mph. In theory there is no limit to the speeds each train could reach. It just depends on how much energy you want to spend speeding them up—and slowing them down again.
It seems like you ought to be able to recover energy, not spend it, when slowing them down.