Stacked Carts Can't Travel Through Portals

Is there no way? I've tried every rail placement I can think of and the stack always lands in the portal frame on the other side. Has anyone had success?

EDIT: I guess it really isn't possible without an outside force to change the momentum... so this is what I did [https://imgur.com/a/2gUhc6A](https://imgur.com/a/2gUhc6A) this is just testing and I have not optimized yet but the test have gone very well