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Man trapped inside driverless Waymo car as it spins in circles
(www.bbc.co.uk)
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One big difference is that someone pulling a train estop for no good reason has to deal with other train passengers who would be unhappy that their trip is suddenly delayed for no good reason.
It's a different dynamic if you're alone or with friends/family in a car, even if pushing that estop is on a highway where it's even more dangerous.