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Wow I had no idea this existed

>Disadvantages

>Weight: a bus which can carry 20 persons and has a range of 2 km (1.2 mi) requires a flywheel weighing about 3 tons.

>The flywheel, which turns at 3000 revolutions per minute, requires special attachment and security—because the external speed of the disk is 900 km/h (560 mph).

It's truly a mystery why they never caught on

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You missed the last and most funny one

>Driving a gyrobus has the added complexity that the flywheel acts as a gyroscope that will resist changes in orientation, for example when a bus tilts while making a turn, assuming that the flywheel has a horizontal rotation axis.

So you have a giant blender than can travel one mile in a straight line before needing to be recharged

Shouldn't it still be able to turn, just not tilt?

It depends what orientation you mount the gyroscope in, but yeah the "correct" way would be to make it axis vertical to limit pitch and roll

There once was a train that made clever use of that effect: https://en.wikipedia.org/wiki/Gyro_monorail

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