Key quote:

In this vision for an alternative train type, there is no track. Stanchions, 100 feet apart, house rollers that propel the train as it passes. The train doesn’t fall even as it’s nose is suspended unsupported in the same way that a pencil on the edge of a tabletop won’t begin to tip and fall until more than half of it is dangling past the precipice.

Nobody would ever build this, but dang is it kind of cool.