gadgetbahn

Any mode of transport that is "futuristic" or "innovative" in theory, but ends up being either infeasible, impractical, or just a steaming pile of shit in practice.
Gadgetbahn systems are often outperformed by the most basic things, such as buses.

The Simpsons monorail is a classic example of gadgetbahn in television
Elon Musk's "3D roads" have been condemned by many as being an overly expensive gadgetbahn

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