The only way it could be B in this universe is if the train also decelerates equivalent to how the people accelerate. If the people accelerate and the train maintains velocity you've created energy in a closed system.
this post was submitted on 18 Aug 2023
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Objects coming out of the portal in "a" have to have velocity coming out (they don't magically appear outside of the portal, they move out inch by inch/ cm by cm). So in a you would actually have double the deceleration on the train because it has to accelerate people leaving the portal and then instantly decelerate them once they have fully exited the portal.
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The Portal can't move front or back, only "to it's sides"