Unfortunately, this isn't testable in Portal because portals can't be affixed to moving surfaces.

I would assume the people just plop out fine since they would retain their momentum (which is nil), and the portal's own momentum wouldn't be applied to them. But God damn it I wish I could just make a Portal map with a moving portal and see.

B) The train transfers momentum to the things that pass through the portal. If it wouldn't, the portal couldn't exist since you need a certain amount of energy to displace the air on the other end.

This platform deserves a community solely dedicated to trolley memes.

there's a video with a great explaination about this: https://youtu.be/B19nlhbA7-E

Dont they need to be hovering mid air for either to happen? I am trying to imagine how would a moving portal teleport a person laying down without teleporting the ground beneath him. I think neither a or b would happen, I think they would be draggen on the ground and splattered, but if I HAVE to choose, I say A is more likely. Because they are laying and not hovering I dont think they will be launched.

Can someone put this in a lambda function for me so I can kill myself trying to figure it out?

This is my favorite post in a while.

This reminds me of when somebody set up the Trolley Problem for their toddler with those little wooden toy trains. The kid put the one guy on the track with the several guys and then plowed through all of them with glee.

B.

Speedy thing goes in. Speedy thing comes out.

Although it kind of depends how fast the tram is going.

I don’t think portals carry the momentum with them. It’s as if the train is a moving tunnel. So A.