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Nothing guaranteed about jamming the train door. They have a surprisingly large margin of error and there've been quite a few incidents where people have had a hand or a coat or a strap trapped in the door but the "doors closed" light in the cab has still come on and the person has been dragged along the platform.
(And the doors have been found to be within spec afterwards)
grams
When confronted with the choice of
I can see why just jamming the door might be the method of choice.