They could call is a derailleur.
I think its lawyers. They know liabilities but are ignorant of precession.
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Gyro monorail
The gyro monorail, gyroscopic monorail, gyro-stabilized monorail, or gyrocar are terms for a single rail land vehicle that uses the gyroscopic action of a spinning wheel to overcome the inherent instability of balancing on top of a single rail.
Wikipedia
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