Very nice. It's a 2D linear motor. That's been tried for robotics a few times. Here's a theory paper.[1] The Minatur Wunderland version doesn't use coils, just straight PCB traces, which is simpler but draws more current. The duty cycle is low, since there aren't that many cars for the amount of track space. They probably have an intermittent overheating problem with the track, the drivers, or both. Here's a Hackaday…
Planar Motors makes a spiffy, but not exactly low power, system. I have no idea whether they’ve sold many.