Describe the Suggestion

We all know, trains through portals are cool as hell.
But, wouldn't it be even better to travel through any type of upright portal?

Let's just talk about how I came to this idea:
I'm playing a small create modpack, including Better End and Deeper and Darker.
Deeper and Darker provides an upright portal from the beginning, namely the city-center of an ancient city.

I tried to put a track through this portal, but with no luck.

Better End is a little trickier. But the Eternal Portal found in the end is indeed upright.
There is actually a reddit-poster, who managed to glitch a train through the eternal portal. (Even though it's fabric)
https://www.reddit.com/r/CreateMod/comments/z5tk64/just_a_odd_thing_i_found_with_better_end_mod/

I mean, let's be honest. Create notices, there's a portal, it just thinks it's a netherportal and divides the coordinates by 8. (Which fails with the eternal portal ofc.) [I think the end coords are 1:1]
But is there a possiblity to make the portal-trains work with different portals instead just the nether?

Let's look a little into the future. The Aether Team is rewriting The Aether legacy mod for 1.19.4. Why only a hell-train, if it can also be a sky-train? 😄

This would open up a hell lot of possibilities with trains.

Screenshots and Videos

Additional Context

No response

Duplicate of #4212