Balance on one railSourced
Spinning machinery kept the vehicle upright
A gyro monorail used gyroscopic action from spinning wheels to balance a vehicle on a single rail. Full-scale working prototypes appeared in the early twentieth century, but the idea did not progress beyond that stage. Fewer rails required balancing machinery aboard the vehicle.
A narrow support came with an internal spinning system.
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Gyro monorail · Wikimedia contributors
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Reviewed: 2026-10-05