sequential (83) motor

https://wodewangzhishime.blogspot.com/2021/07/httpswodewangzhishime_78.html
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Ref:  https://wodewangzhishime.blogspot.com/2021/10/httpswodewangzhishime_16.html . 

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John: When a train is forwarding slowly at the junction during a rail-switch, if hacker break-into the control house, yes, there will be an accident, however, the accident won't be tragedy.

Me: Because, the train is forwarding slowly.

John: Correct. . The faster the train is forwarding, the more tragedy the accident.