Futurology

Yup. You're essentially building an oil pipeline, but bigger, and then building a maglev inside of it. But with even stricter requirements for turn radius and even longer emergency stop distances.

When it was first proposed maglev wasn't a practical thing, and on wheels there wouldn't be much point, so that's improved. The financial aspects are still questionable at best, though. Maybe if investment returns get lower across the board in the far future it could become viable.