As someone who suffers from motion sickness, and whose children are the same, with trains being the worst offender (since we can't look forward which mitigates the issue somewhat), I do not look forward to this future.
In trains it's better to look towards the back of the train. So do it next to a window, but with your face towards the back of the train.
This at least according to one person I was on a train with. I had a reserved seat looking towards the back of the train. I (and most people) don't like those. The other person really wanted my seat because of motion sickness. So we were both really happy to switch seats :-D
