Seems something changed with 2.0, probably has something to do with elevated rail existing.

You can get hit by trains on non-elevated rail while riding a zipline, and then it respawns you back on the zipline (though that's probably less of an issue than just getting hit)

It's not the elevated rails but yeah something did change in 2.0

So when the player gets on a zipline I swap their in-game character for a copy that has no collision so that it usually DOESN'T hit trains and stuff, but in 2.0 they for some reason changed that functionality. Whenever I swap the player's character it now also resets your zoom level back to default which I dont like because I find really jarring. So for now I changed it so that the player character doesn't change meaning it has the same collision as normal. I asked if they can add some option to NOT do that so we'll see what happens lol