Probably is not the purpose or how is coded the mod. But something cool for test adding is the support for create contraptions trains
Its kinda be interesting have a full cross-dimension utility for trains and other dimension mods or custom mod dimensions...

Currently I don't think this would be possible. 1 car maybe possible if Create considers Trains as entities, but the links between cars would be destroyed upon travel.

This is likely possible with Immersive Portals, as I have made vanilla rail systems going back and forth through them both within same dimension and between dimensions. But that only works I believe due to the two sides having their chunks loaded and rendered with the portal being treated as a seamless transition point. If Immersive Portals could work with Cosmos Portals then that would let you have the desired effect, but I have no idea if that is possible. Immersive Portals also does have some issues working with other mods due to the way it has them working so it can be a problem in a larger modpack.

EDIT: Immersive Portals are also able to be bi-directional, which differs from Cosmos in its operation.

Inmersive portals is a extension of nether portals, you cant use these portal cross-dimensions excepting nether. Cosmic is a mod usable in custom dimensions, thats the pruporse of the integration with create mod (create mod cant move into other dimensions), the only cross-dimension mod in 1.18.2 its cosmo portals

Inmersive portals is a extension of nether portals, you cant use these portal cross-dimensions excepting nether. Cosmic is a mod usable in custom dimensions, thats the pruporse of the integration with create mod (create mod cant move into other dimensions), the only cross-dimension mod in 1.18.2 its cosmo portals

Since when? I have used Immersive Portals for ages on Fabric and it always had full operation within the same dimension and across all dimensions, though some mods are incompatible. I just chucked up a new Forge 1.18.2 instance with Immersive Portals and a bunch of random dimension mods I haven't even used before and I was able to generate Immersive Portals between the Overworld, Nether, End, and the other modded dimensions with no issue whatsoever and it worked flawlessly.

I've searching and create contraptions are considered entities (carriage)
Also teleport system its individual over normal teleporting. using fancy lines to trace train routes and runs teleport when a "valid nether portal" its detected

all comes from package com.simibubi.create.content.logistics.trains.entity; into tickContraption

Theorically the most viable method to implement that its add a new item to "connect" a trainrail (from an y dim) into portal and make portal a teleport rail (From other rail)... i am not a good modder so probably i am saying silly things.

hi again, long time i arrive this repo.
i was interested to make a PR adding Create compatibility (tweaking some stuff) btw i see the source code of 1.18.2 isn't avairable, just for 1.18 without gradle filles (or any other important stuff). is branch outdated or is just a private repository? because mod was updated 8 months ago and last repo update was 1 year ago.

so if was possible get source code to make a PR would be asome :) (if was possible)

Hi, I have been lacking on updating the repo I will be fair, I will upload the repo as soon as I can.

Ok, I'll wait then :)